It takes my bees more than the first season to fasten the foundationless comb to the sides and bottom of the frame, so be careful as you inspect those frames until they are attached well enough to keep the comb from warping and falling on your shoes. HTH 
Having said all those things above, I feel compelled to say that my preference is a good plastic foundation like ritecell in a wooden frame. Once you have extracted honey from your other foundation options, you'll understand why. 
P.S. To the OP: In my view, too much is made nowadays about cell size. The majority of cells in my foundationless frames are the same size as those on ritecell. Bees will rework cell size to suit themselves, even on plastic foundation.
Wow.. LB Said a whole lot in his post...
First, let me say I agree with Woody. Good post.. THe bees will build Drone cell when they think they need drones. In a nuc your keeping well managed they will draw worker comb.. In a new hive that is just starting to build up they will draw worker comb.. Once they reach a certain hive size specifically decided upon by the bees they will start making Drone comb.. Typically I have TWO full frames of drone comb, sometimes as much as another half of a frame as well.. I am fine with them having and using drone comb to that point. If they make MORE I cut it out or swap in a drawn frame of worker comb and do not usually have to fight them very much over it.
LB has some good points, but I have different experiences of a couple of those points. I will start with extracting.. Using a radial extractor my foundation-less frames extract VERY nicely. So long as top and bottom OR top and sides of the frame are attached I do not have any problem extracting.
FRESH drawn comb that is not well attached is easier to blow out. Swap it with a frame from lower in the hive. Wax that is a little older and stiffer will extract splendidly, so long as you use common sense.
I will however agree that plastic is easier. Drop it in and turn the extractor up to WOW.. With wax or Foundation less you need to start it slower and work the speed up.
As far as how long it takes for bees to attach the comb.. entirely depends on the bees. I have bees starting frames that run immediately to the bottom bar and are VERY well attached before the frame is even 1/4 of the way completed. Other bees seem reluctant to draw ANY side or bottom.. Making sure bee space is correct, between frames, as well as between the side walls and frames is important. If you have a frame slid over too far against a wall the bees will be more reluctant to draw the sides of the frame. Like LB said.. you MUST use care when inspecting those frames that are not well attached yet. They will seem fine, you tilt it up to look, and in the blink of an eye it will be laying on your boot. Yes I have.. and the bees take a considerable amount of insult as very personal "when" (not if) this happens.
I will not disagree with anyone who uses plastic or wax foundation. Never! Then why don't I use it? Because I would have well over $2000.00 Invested in JUST foundation if I used it. Seems to me that any extra trouble I have in making sure the foundation is straight, as well as using care extracting it is VERY MUCH worth saving $2000.00... I use foundation when I have it.. Wax, or plastic, but I don't BUY it specifically to use it.. When I get it, It is because I found a deal on some beekeeping goodies and the foundation was part of the deal. So I am quite happy to use it..
I have spent some time measuring cells.. I have to say, that there is a LOT of misunderstanding going on out there.
If you drop a foundation-less frame in your hive, your bees will "NOT" build small cell.. In fact they are likely to build Drone comb first. Regression takes a little time with foundation-less, not as much time with small cell foundation.
Like LB said, the BEES will decide what to build. You might be AMAZED if you look at what the bees build compared to the foundation under it.
My foundation-less frames have small cell, and SMALLER than small cell... cells.. But the bees do not BUILD a frame of all one sized cell. It may be 4.7mm in the very center and 5.4mm along the outside edges.. I could provide you with PROOF that bees build smaller than 4.9mm if I took a picture with the ruler in a specific location on a frame, and using the same frame I could PROVE to you that bees on natural cell build large cell foundation if I took the picture in the right place. To me it is not so much the cell size, as it is letting the bees build what THEY think they need. It is a bonus to the foundation-less approach, not a means of controlling mites.. but, if it helps? I am all for that too!
As stated, the primary reason I use foundation-less is cost. If you do not have 40 to 50 hives the cost of a few sheets of foundation may not bother you at all.. SO just give them a frame or two of foundation less and let them build their drone cells! They will back fill those with honey for winter.