Yes it is very slow, but they put them up on their Facebook page, much faster :) If I remember correctly there was 1 or 2 not on the Facebook page though.
And for me it is all about convenience, much easier than dragging out one of my half stacks, and certainly much less noisier, not all people can be cranking up an amp when they want to record something. I am quite happy with all the amp sims I own, I really like the sounds I can get, having presets, just the general convenience, do they sound as good as the real thing ? probably not, but then if you let that go, you may find they sound very good in their own right, even convincing. At 51, I'd much rather the convenience over dragging out an amp and all the messing around setting up etc, and I am happy with the sound trade off. My amps basically gather dust these days, and rarely come out.