http://bumping-beatz.tk/ and http://stunningbeatz.tk/ are on 000webhost for testing purposes and it works fine. http://strictly-discussions.tk/ has stopped.
http://strictlyhonest.com has been on 000webhost for a while (without problems, sometimes hitting the dailly limit on own IP because I like to customize a lot, but hey, it's free), switched to hosting24.com because traffic was increasing and I wanted to offer a great experience for the user so I decided to pay for a website for the first time in my life but the problems started there, my website was disabled many times a day for high cpu usage (didn't happen on 000webhost) and hosting24 decided to shut it down in the end instead of helping me what was causing it (asked it many times)
Now it's running on hostgator and have never seen any problem there.
I use 000webhost for testing and needed to test PHPBB3 which really works fine but decided to use MyBB in the end: http://Godlikediscussions.tk (hosted at Hostgator) and also started http://g-beats.tk/ there for fun (unlimited domains/databases/space so I can play a lot)
To make a long story short: my experience with 000webhost is good and I use it for testing purposes, my experience with hosting24 is bad, I avoid them now at all costs.
PHPBB3 is easy to use and setup, MyBB is less easy to setup but I like to customize and I think it was a better choice for me.