I am a member a few different RV forums, so I have read more than my fair share of threads about the Andersen hitch. From what I have read it seems like the Andersen hitch does a fair-good job of WD on trailers with a tongue weight of 800lbs or less, and that when on bigger TT's with weights of 1000lbs or more the Andersen hitch doesn't transfer enough weight back to the front of the TV.
I run the Andersen hitch and really like it, but my TT is fairly lite at only 6500lbs and a tongue weight nearing 700lbs right now. And with 1/4" compression of the bushings I am able to get the front end back to within 1/8 inch of its empty height and the rear to about 1/4" lower than empty:
(all measurements taken at wheel well openings)
truck empty-- front 40 1/8", rear 40 1/4"
camper hooked no WD-- front 40 3/8", rear 39 1/4"
camper hooked with WD front 40 1/4", rear 40"
For me this hitch works and I like it. My cousin was looking at buying a hitch for his 32' Kodiak TT. He liked the looks and ease of the Andersen, but I actually talked him out of it and into the Equal-I-zer since he a tongue weight just over 1000lbs, and told him that he probably wouldn't be as happy with the Andersen as I am.
Also I have been keeping my eye on craigslist and ebay for a Equal-I-zer, so I could try that and actually see for myself if there is a big difference being that this Andersen is my first WD hitch.
Our TT has the 81911 and we have the Andersen hitch last year we put on only about 2000 miles. If we still have the TT and the couple would have to be replaced at some point down the road, I would install a Bulldog hitch. We have Bulldog couplers on numerous trailers, one of which has more than 100,000 miles on it and still has the original coupler.
I do a "pre trip inspection" everytime that we are packing for a weekend. Because of the issues that some have had with the Andersen hitch and different couplers, I make sure to check the coupler just to look for anything out of the ordinary.