I've made a number of "concertina-reeded" instruments over the past year and a half, in addition to the 400, or so, hybrid-style concertinas over the past 14 years. My prototype concertina-reeded Heritage concertina was made with a laminated reedpan.....aircraft grade birch. There are 10 to 12 layers per quarter inch. This is much better grade of wood than typical Baltic birch laminate, and is very hard. I am currently using the prototype as my primary performance instrument, now. Comparing it to the other concertinas I have made with sold hardwood reedpans, I can say that the solid hardwood reedpans have a bit stronger tone than the laminated one, although the tone of the laminate is definitely very musical, and very similar to the tone of the solid hardwood reedpans. ... just a bit softer. I used the laminate for the prototype for several reasons: (1) since it was my first attempt at making an English-style (concertina-reeded) reedpan, I was not sure I would not make a mistake and ruin it. If I used a solid hardwood, I would then have to resaw and plane down another piece.....not an entirely insignificant amount of work. In fact, the first RH reedpan did have to be made again for layout reasons. The laminate is already in the appropriate thickness. (2)The laminate is very stable, the same reason Colin Dipper suggested it. While I am currently making concertina-reeded instruments with solid hardwood reedpans, I would not hesitate making one with the laminate birch reedpans if someone were to request one. It's always been my policy to only make instruments that I would be happy playing as my own.