Try the 2-week demo you get with version 4.9 of the UAD software. I did that a few weeks ago but still haven't decided if I'll bite the bullet and buy it yet....
I found it to be a nice addition to their arsenal, and damn easy to get the desired effect. I already have the Waves TransX and it serves its purpose most of the time, but will probably get the SPL UAD plug if there's a deal going on it at some stage.