Hi Smithy,
They certainly aren’t cheap but I found it a bit of a PITA when i needed to adjust the chain recently. Mainly due to having to go between the centre stand for adjustment and side stand to check slack and guessing how much to adjust just to find it was too tight when back on the side stand!
I have some swingarm bobbins on the way so i can adjust and measure on a paddock stand with loaded suspension from here on out.
That will hopefully solve most of the hassle and save the expense of the flash adjusters.