Freezes alot
When I first got it (free version) I believe it only allowed me to upload 2 or 3 pics at a time. I paid for the full version so I could upload unlimited. In the beginning it was great. Now all the sudden some pictures I cant watermark it just doesnt add the logo. It freezes a lot. Its a real pain to deal with. They need to fix the bugs in it for sure!
Bgoplyr about
iStamp+ - Batch Watermark Photos, v1.8.0