they are good kits. d8veh is specialist on all things from bmsbattery.
the Q100H 36V350W delivers 50% more power than the Cyclotricity e-kit which uses the XF07, about the same power as the £550
Woosh Big Bear front kit. The 11.6AH bottle battery from BMSbattery requires the same space for fitting as the 15AH square bottle from the Big Bear kit. The S06S controller is built into the base of the bottle fitting, tends to pickup moisture dripping down from the bottle and overheat. It's also difficult to squeeze all the wires into such a small space. All the LCDs do about the same job, you are OK there. You may have trouble fitting the 504 PAS with your bottom bracket. The King Meter speed sensor is standard part, widely used, you won't have problem there.
One thing you should note, the 11.6AH battery has 10A continuous rating, that will put a severe limit on climbing power of the Q100H, which can take 20A-25A. The S06S is rated 15A, you need really a BMS that can deliver at least 15A continuous. The devil is in the details. After choosing your motor wheel (RPM, voltage, current, reduction ratio, gearing system) - you need to read up quite a bit on the rest of the electronics. Which cells? which BMS? which controller? which PAS? which display unit? the differences are subtle, yet important to achieve good results. It also becomes more and more expensive to pay for freight whenever a battery is in the shipment, typically $150+, and also, cwah got stung recently quite a bit by import duty and VAT. £300 for a motor!
http://www.pedelecs.co.uk/forum/threads/custom-charge.17920/