Hi Dan, I'm in a similar situation to you - interested in full sized folders (and I'm Tall), but I havent found anything yet. The Dahons seem to be good quality and prices but they only seem to fold in half which make them way too big to take on my crowded commuter train.
Maybe you dont need to take it on the train, bus or tube ?
In which case, there are a couple of favourable test reports on
www.foldsoc.co.uk. Another full sized folder is Montague (
www.montagueco.com) which also gets good reviews, but again it is not suitable for london commuting - the front wheel needs to be removed !
I am sure many people here will say smaller wheels especially 20" are OK, and make the best compromise - and I have taken that route too and have two 16" folders which i fit fine (Strida3 & BromptonL3) and are perfect for the commute ...... However after riding MTB's off road at the weekends, I too wish there was a practical full sized folder.... Si