Excellent piece of kit...and at £90+ so it damn well should be!
Only £90? This comes to you from one of
these (click) - the price is not a typo because they're hand built and hand wired. Cherry MX black switches mean it's a little heavy under the fingers (it reminds me of the BBC Micro days), but I'm sure they'd be amenable to building a keyboard using a different Cherry switch if you ordered one. I'd like to try a Maltron keyboard using Cherry MX brown.
The Maltron layout takes some learning, but it's so much more efficient. The more optimised layout and the ergonomic shape of the keyboard means I'm able to type for much longer before my neuromuscular condition kicks in. I can still type on a conventional QWERTY board (it helped that I learned to use the Maltron board in Maltron layout, so my brain automatically adjusts for the correct layout depending on what sort of keyboard I'm using), though not for very long. I have the dedicated pilot style case for the Maltron keyboard - if necessary, I take it with me!
The trackball is very useful and in just the right place, but I wish Maltron would switch to using an optical trackball. The OEM makes one that should be a direct replacement for the mechanical trackball they use. Mechanical trackballs are so 1990s - I get a little fed up of taking it to bits to clean out all the fluff in its innards. I rewired my button PCB to make the buttons left centre right (default is left right left - you have to cut some tracks and solder in links to change it), with the centre button also triggering a mouse wheel emulation.
If you struggle to get on with the software for your keyboard buttons, there's always
Autohotkey with AHKHID.