I also favour JJP for Harry Potter, see no other way to do the theme justice.
I like JJP pins, how they look, the code, you really feel like it is a premium product. But.... their theme picking is a not their best part. Not bad, but nor great either.
But biggest problem with JJP is the lay out, i dont like any of them. But one day JJP will pick a theme i love and give it a lay out i like, and than all the normal JJP features and code... will be amazing.
One thing i want to add to the picking of a theme. JJP should not only pick a great theme cause it is great, they should also be 100% sure they can use the theme how they would like. So, with music, call outs, videoclips etc. when they are not allowed to use important parts of a theme, dont pick that theme!!! Why pay for it if you can not even use it? With POTC..... unbelieveble... Such a fantstic theme, but can not use music and main characters...
But JJP will make me buy an awesome NIB one day. I am pretty sure of that.