I received my 440MLa yesterday, installed it last night (Origin Live OL1 arm with all upgrades, on a Technics SL-1200MK2). It's replacing a Shure M97xE. First impression is the AT is more detailed and quite a bit "brighter". The Shure is "relaxed" in comparison.
I'm tracking at 1.4g, antiskate set to 1. I suspect the VTA is a little off. I think this gives me the excuse I need to get the VTA adjustment option from Origin Live.
Nitpicking: The stylus cleaning brush supplied by AT needs a 90 degree angled head on it like the one supplied by Shure. Also, if this cartridge is new to you, you might want to look at how the replaceable stylus assembly attaches to the cartridge body very closely before you install the cartridge on the arm. I removed the stylus prior to installation, then had trouble lining things up when reinstalling it. It's a little tricky, and you don't want to use too much force.
The cartridge itself looks very precision-crafted. Impressive.