The plastic Bosch ones come in a variety of flavours, whether it's the installation location or the part itself, I'm not sure - but in the 20vt application they don't seem to last too long.
Having said that, my Saab's still on its original one and has been running over 20psi of boost for the last 50k and has done 197k in total. It's just started to go spesh now, so it's had a good innings!