Visually very appealing. As far as I can tell, the pistons are for show only (there's no reason to risk getting on them...). Nice little secret alcoves.

A pretty well thought-out level. There are a few annoying glitches, but nothing fatal (even on a 68K mac). A lot of running back and forth...

This one looked interesting, but I got freezing crashes twice during testing, and gave up.

If these maps remind you of the Suicide series, it's because the creator of that series got the three Demolition collections started. All three of these collections have 10 maps in them. Most in this set are modified M1 Bungie maps (very much in the spirit of the first few Suicide maps, only with better texture alignment. Great flow, more weapons and ammo than you can ever use, no aliens. Very nice.