I got these recently and they definitely made soldering up the wires easier and setting the resistance. I took Jeff's suggestion (via email) and put a dab of fingernail polish on the top of the trim pot to make sure that they would not get out of adjustment in the future.
The only quibble that I have on these, and it is a minor one, is that they come with the back shells. The Gecko G540 already comes with the back shells, so I have a bunch of extras now. I'd have rather saved a bit of money and not had the excess parts.