The second halves of Low and Heroes haven't aged very well; way too synth heavy and dated sounding. Eno's ambient solo work from the same period are a lot more low key and more to my style.
I readily amdit to being ignorant of most of this genre, as I've long shrugged it off as new age-y, Yanni shit.
EDIT: And to answer your question re: which Eno ambient albums I've heard, just Music for Airports and Apollo.