They go from anywhere between 250 and 299 depending on where you get it from. Yeh would definately hold boost better than your $22 thing and you have 2 stages of boost aswell so thats a plus.. Still would get a little bit of creep but if you want to almost eliminate wastegate creep you'll need a good ebc. I have a turbosmart Eboost 2 cos i was able to get one for cheap...awesome bit of equipment. 3 stages of boost and holds boost all the way through to the top of the rev range.
my 2c