edit: oooh, tinkly bells!

They're quite something, aren't they?
I only have about -5 minutes to write something because I'm already going to be late meeting a friend for Borough Market shopping, dinner + pumpkin carving (!), but here are some initial impressions:
They threw the toy box of continuo instruments at this one didn't they! Not having liner notes to hand for some reason, I assume the bells were an organ stop? But surely the harpsichord, guitar, lute (?) and harp weren't. I really enjoyed that, and the variety it gave (particularly in the variations in the A major - the non-scordatura one - I haven't laughed outloud with joy at a recording in ages - when the harp came in with the cute violin staccato variation, it was a delight!). It's a joy to have so many toys to play with. But that's a big reason why I wouldn't trade my MAK recording - they use nothing but harpsichord+cello throughout. A much more practical combination from the point of view of someone who wants to play these herself but doesn't have the keys to that toybox, and in some ways you have to be more creative to mix up the texture when you have fewer options to hand.
Also I'm not sure the two violins (the actual instruments) are particularly well matched on the Rare Fruits disc. I don't mind
different sounds, as long as they are of an equivalent quality, and the MAK disc has that - each player has different but balanced strengths, and the sounds of their instruments mesh well while being distinct. I'll have to listen again, but I think one fiddle sounded a fair bit weaker (not in playing but in tone) on the Rare Fruits disc.
And I never thought I'd say this, but I think some of Reinhard Goebel's tempi are more reasonable.

I understand the desire for a moving bass line, especially in some of those variations, but flowing doesn't always have to be fast. It's a quibble, it's not by very much that it bothers me, but it does just a hair. Sometimes the movements in three seem to rock slightly, and I didn't like the tendency to overdot in the opening movement of the G minor. (Although MAK tend to
underdot the very opening, before the bass starts to move in crotchets, at which point it becomes delightfully strict and strong without losing forward momentum.)
But on the whole it's a tremendous disc, and I look forward to hearing the sonatae tam aris quam aulis servientes when I return home later tonight.