Drip Rail Chrome Trim? Opinions?

[muddpile]

I have decided to do the top of my 72 white, but not in the conventional way with the pillars and everything. I will be doing from the drip rail up and back, and stopping on the factory 2-tone trim at the back of the cab, sort of like a painted shiny vinyl top. My question is, I've seen the drip rail chrome that you buy, but how does it work, and is it worth the effort (If I recall it was kind of expensive). It looks like it snaps on or something, or stays with an adhesive but I can't tell. Any help would be great, thanks!