I've got a wire bead Larsen and Crossmark on XT rims w/ Stans at the moment.
I haven't used UST tyres so I have nothing to compare them too but I've had a puncture and it sealed straight away. Mine have held air well. I've only pumped them up a bit once in the last month.
Definitely get a compressor. I managed to seat mine with a track pump but it took 4 hands and a lot of swearing