For the money I'm quite impressed with the couple of boxes of AML I've used over the past year, and will definitely use it again when the need arises. Joins nicely to LGB, you may need to ease the AML fishplates open a fraction to slide onto LGB rail, and going the other way LGB fishplates need a gentle squeese before sliding onto AML rail to ensure a tight fit.
Not noticed a height difference with this recent stuff, unlike a box of track that some friends bought a couple of years ago that did indeed seem to have a slightly taller rail profile. Rather than chamfer/file that stuff, we found a tap or two with a hammer was enough to equalise the height.
As has been mentioned, the sleepers are slightly squarer looking (much the same way as Piko sleepers look squared off compared to LGB), and the brass seems to tarnish more slowly than LGB rail.
Bought mine from Track Shack, with excellent service.