that kit has a 35mm rear drop. i emailed them... lol. im thinking about getting the same kit. its a good price and i think some people get abit snobby about the kit they use. granted you get what you pay for and the more expensive stuff will be better in the long run but it depends if you want to do track days.. or just after the 80 drop
i know im gona get a load of stick for that comment but if you want a super duper amazing top of the range suspension then you'l need to pay for it...
i have heard good things about janspeed too. better rep' than jamex and gmax etc from what i have read on tinterweb.
hope this helps