Just received the humminguru and I like it and the results.
cleaned 6 records yesterday in about half an hour.
operation is simple-
fill the removable reservoir with 400ml distilled water to the line.
pour into the top of the unit.
insert the drain reservoir into the side of the unit
drop the record through the slot, press gently.
hit the "auto" button twice, then press the center "go" button.
record will clean for 5 minutes, drain the water into the drain tank and fan dry for 5 minutes.
to clean another record just remove the reservoir tank and pour the water in the top again, replace empty tank and go.
works very well. there is a very comprehensive thread at the Hoffman forum.