Interesting. In the recent thread "top ten plugins" not one person included UAD-1 on their list. I've been a little hesitant to use their processors in larger projects due to fear of what the latency compensation might do to sync, but I use them extensively in commercial mixes. Though I used the L1 exclusively for many years, I think the Precision Limiter blows it away.
The fact that much of the UAD-1 lineup is by design not transparent could make their plugs a little less attractive to post people. It was also mentioned in the other thread that a large percentage of post is done on PT HD systems, for which there are are a high number of good emulation plugins already.
Post audio: top 10 (or so) plugins