Originally Posted by Sheldon Brown
OK. The adjustable dropouts are kinda funny looking, and as you adjust 'em you need to make sure they're even or the wheel will get crooked. However this is no more (nor less) an issue than anything using traditional horizontal dropouts.
The eccentric bottom bracket is a bit heavier.
Adjustments of the bottom bracket also affect the effective seat tube angle and bottom bracket height. In some cases this is a benefit, in others a detriment.
Sheldon "Slightly Prefers The Adjustable Bottom Bracket" Brown
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Adjusting the drops will also change things, in height ( of wheel center) and chain stay length. But I doubt most people would notice the difference. If I read the dwgs right they move 12mm at an angle of 20 degrees. Change in wheel center looks like it could be around 5mm max vertical 12mm horiz. Just rough guesses glancing at dwgs and drinking a beer.