it's partly due to our desire to reduce the range of not road legal kits and partly because we don't make any money from BBS02 sales. The failure rate of controllers on the BBS02B is something like 3-4 times that on the BBS01B. Internal controllers on CD kits are fragile, coupled to freely available programming kit for the BBSes multiplies the commercial risk. I made the point of stop digging when you are in a hole a long time ago.
There are some very active modding sites for the Tongsheng too, I don't know if I will be able to resist the temptation to meddle with the electronics if I get a kit from you though! With regard to after sales service, I definitely will not be getting a kit from Pswpower, there are too many disgruntled pedelecers with after-sales problems from them. Having said that, I thought I would be safe buying a UK made (from Chinese bits)bike from Freego in Southampton, and now they have just gone into liquidation, so no after-sales service there either. Not that I'm saying Whoosh would go the same way-at least I hope not!