I've seen and played a 2 manual house organ by Skrabl, that looked similar to those being advertised in the Early Music Shop, though I know it wasn't acquired that way. I was extemely impressed by the quality of the action and it made a beautiful sound as well.
I've also had a look at the Lyme Regis organ. Again, the mechanics were first rate: absolutely stunning. It was perhaps less convincing tonally, I felt there was too much organ for the building, which had then been quietened down to make it work. It all sounded a bit restrained, and possibly a little confused in conception. Of course, this might not all be the fault of the builder.