I don't know where you shop, but their employees need to go back to school.....quickly.
I am sure there are some cheap kits that might fail in a short period of time, but if you buy a good American made kit, that will not be a problem.
I don't know what brand Eurocharged uses, but I went with Vertical Doors out of Corona, CA. Besides having done this for years, they OWN the patent on the "out and up" mechanism. They have been very vigalent about cracking down on cheap imitations. Their kits are specific to a vehicle and are bolt on (take 'em off if you change your mind). They also include a modified washer bottle to allow for the new hinges. Some of the early conversions simply removed the washer bottle.
Going through me, you will pay around $1000 for the hardware, go direct and you will pay more.
Vertical Doors, Inc. - Chrysler 2004 - 2008 Crossfire :: Vertical Door Kits :: Direct Bolt on Kits
That is my black SRT6 in some of the photos.