I've been using the GDS for about 3 years and I get the same crap from other umpires (who do not use the GDS) and our evaluation people (who refuse to use the GDS). Personally, I couldn't care less what anyone else thinks about the GDS.
1. It is comfortable for me.
2. I have never been more consistent in over 20 years.
3. My timing is much better.
4. Most important - I get a longer look at the pitch (as Tee stated).
I've had a couple of coaches in HS have a comment about setting up farther back than other umpires. When they have a wise remark, I just tell them to ask their catcher how I'm doing! Never another word!
So Tee, who gives a rat's rear end what anyone else thinks? Hell, I'm old enough to retire and D1 or MiLB umpiring is just not in my future anymore!