I have the select switch and i wish i had the select plus.. mainly because i love playing with gadgets but also so i can have a "valet mode" style switch to prevent the dealer from totally ragging the car..
i know with the select you can only have 2 settings, stock and performance but if you want to be able to save more like i want to now then go for the select plus, there is actually someone on here selling one at a bargain price!
Well worth it.