I really like and would recommend the Badstone build. The phase shifting is much more of a modern sound (even though it is a 70's era pedal) than is with the phase 90, 100 or even the Ross (my runner-up choice). It is definitely not subtle. The phase shift is loud and clear even on a clean guitar. I built one for someone who preferred Boss PH-2 and PH-3 sounds and it did not disappoint. It seems more transparent than the latter day Boss pedals as an added bonus. Nothing against the venerable Phase 90, it's really cool for what it does as a more vintage sounding unit.
I've been really curious about the Maestro Stage Phaser as another deep phase shifter. The sound samples of that unit on mode zero are pretty amazing.