Gibson Flying V machine heads?

[bdc]

I'm gonna put new machine heads on my 1999 67 Gibson Flying V........I want drop in (no mods-no new holes) replacements....

I'm looking at Keystones by Gotoh, Tones pros, Grover....and leaning toward Schaller....I read a couple real bad reviews on tone pro's



Question? What are the opinions on these products vs OEM.....

Thanks in advance.......if anybody can help......
and please don't give any advice on how to keep my guitar in tune with my crappy stock tuners......I already know!