I'm in the market for a single-space power amp to rundownstream of an Alembic F-1X. There seem to be a couple of candidates. Stewart Electronics' World 1.2 and SoundTech's PS802 The problem is, I'm not familiar with the "High Frequency Switch Mode Power Supply" that the two companies tout as the reason for the smaller size and lighter weight of the unit. Are there any drawbacks to the this technology as oppossed to the traditional capacitors and transformers? A description of the World 1.2 is available at http://www.nextgener.com/ngm/stewart/world1-2.htm. The SoundTech is at http://www.soundtech.com/product/amps/ps802.htm. Any advice/caveats? Should I bag it altogether and opt for larger and heavier alternatives (e.g. Crown 1000)?