I think they sound great, but like others have said, they are basically SLOs - if you really like the sound, you really like the SLO sound.
Just like the SLO, the low end is going to be round and you're going to need a boost to play metal or else it's going to be a little flubby.
Just like the SLO, that round low end is going to make leads sing and sound absolutely glorious
I haven't played the apocalypse, so that might be different than the Mzero and Trinity, but IMO they all sound great
basically if it was me, I would absolutely grab one if it was a good deal and I wanted that tone - for new prices though? I would just buy a BAD SLO and be done with it.
OTOH, if I wanted that sound for shorter cash, I would grab a Jet City 100 head