I don't really have that much to compare with, but I have quite a bit of minimal psytrance, psy-techno, and quite a bit of older goatrance. I'd have to say older style goatrance (Astral Projection, Transwave, Technossomy, Miranda, Hallucinogen, etc) is extremely difficult. It may be 4/4, but there's so much going on that its difficult to mix in another track without obvious clashes. Even if its the same bpm, 4/4 meter, there's so much subdivided its a pain in the ***, but worth it if you hit it just right. Another problem is the bpm, most of AP's Another World is 160+ bpm, with my favorites above 170, I don't even have anything else that fast!
The newer, more minimal psy trance/techno styles are relatively easy to beatmix, but like the previous posts, probably anyone could beatmatch a 140 bpm Shiva Chandra or MOS or the like, but long mixing and set progression is difficult.
Also, Mark Allen is a god. I originally heard his old goa mixes and was impressed with the skill then, and recently saw him live with Tim Healy. They did an hour as Quirk w/ Tim alternating tracks from an Akai sampler, G4, and keyboard w/ Mark on cd. Mark Allen followed it up with a 2 hour house set. It varied from hard to deep, soulful house, and it was just perfect. Every transition flawless, great buildups through mixes, breakdowns, everything. I normally get bored with house sets, but I and everyone else could not stop dancing. And the best part, he played a huge variety of tracks that were new to most of the crowd and kicked ***. I get tired of the same stuff over and over, I swear, more than half of most sets is the same stuff as the previous week with some of the local dj's. Again, its hard to mix house well
