It's definitely worth the price of the kit itself I think, it looks awesome. Even though it's just stickers, the end product doesn't look cheap at all, and I think it's well worth it.
I'll ask the dealer about getting that primer off, I think they would have charged a half-hour labour to install it minimum, so it's not really that expensive to have them do it, but I was impatient and didn't want to wait for an appointment