I bought the 3000 a couple of weeks ago, when it was £187 from Rutlands. I'd pay more for it. Its very, very, good. Comes with everything to start off, 15 abrasives, 2 glass wheels etc. Fed it three chisels I'd lent out which had been used as metal detectors. Within 15mins all 3 were mirror finish cutting edges and I was able to shave the hairs on my arms with them.
I hand sharpened a 130 year old Matheson blade off an infill plane I'm restoring. (It was found in a shed which hadn't been opened for over 11 years - you can imagine the state). Took 5 minutes for the edge to mirrored and cutting hair.
Yes, all the machine is is abrsive stuck onto tempered glass. You can do the same manually. I've achieved similar results in the past with the oilstones I've always preferred - but never as quickly or as simply.
I haven't used the "see through" wheel yet.