I do like it. I paid the extra $20 to have the custom domain b/c it was easier to put on invititaitons and have people remember it. If you want something super custom and personalized, it might be too standard. But if you just want an easy to place to lay out your information in a very straightforward way, it's great. We've gotten a lot of compliments on ours. I think Wedding wire is pretty similar in features - you should look into that one too
Thanks! I'll check out wedding wire too. Yeah I just spent some time browsing the knot and I think I like the simple feel. I don't really need a ton of extra features of a paid site I don't think. I saw the domain option and maybe I'll consider that, I didn't think it would make that much difference, but you're right in that it would be shorter and easier to remember if you pay extra.