The reason I bought one was so I don't have to own two guns. I have a G34 that I shoot in production and with this slide I am just swapping out the upper (and ejector = $5) and I have a limited gun. I already own the magazines. This is alot cheaper than the $650 bucks a new G35 is going for here locally in the shops.
I tend to shoot one division during any given year and change divisions from year to year. (last year was Limited, two years ago was L-10, this year is production)
Regarding the fit, heck its a Glock, if I wanted precision fit, I would buy a something else. Besides, I am not that accurate of a shooter, (nor do I know any) that requires more accuracy than a stock glock can provide.
I see where you are coming from....I will say though you need to make friends with a local police officer or firefighter so you have get the glock reduced price