I personally haven't used one, but they are imports from china i think you'll find, not sure of the quality on these chinese imports, not sure, the jury is out on these i surpose, i now that the intercoolers from there are pretty crappy and are prone to cracking. Going by other imports from there they're not the best quality you might be better off going for a 'brand name' item such as garrett or the like, i run a T25 from a CA18DET on my A14 and it hasn't let me down yet, spools up real nice!

Maybe someone else on here has used one?

I want to turbo my A15 and im looking getting a t25. theres a few generic and el cheapo ones on ebay but im not sure if i should trust them? anyone had experience with these? also theres a few with combined t25 size compressors and t28 turbines, would this be too big considering im after more 'all round' response? cheers