I use Discasaurus and I haven't had any problems with it. I've been in contact with the guys who run the app and website and they were very helpful and promptly took care of the things I needed help with.
As for people having issues with the par being different than what they want it to be... change it. It is such a simple app and it take 3 seconds to change the par or distance of a hole. I've been using Discasaurus for about a year now and it works really well. It is quick and easy to use and I can plug in a score quickly then get back to focusing on my round.