yes, I have. I am able to boot a few games, such as ALUNDRA, FF7, XENOGEARS and CASTLEVANIA: SOTN. It really depends on the BIOS used. It is a very glitchy emulator, psx4all. I would recommend loading either scph1001.bin or scph7001.bin for those few games I just mentioned.
Some games, like FF8, either the USA or European rom, won't boot at all no matter which BIOS I was using. We will have to wait till this emulator gets optimized in the future. In the meantime, don't get discouraged if you can't load a certain game. It's perfectly normal right now.