I absolutely love the heden motors. maybe a year or two ago they were purchased and the customer service is a little quicker i believe. i think that preston motors are only common because they are an american institution, but frankly i think that they are way behind the curve.
so many positives to heden:
-very easy to swap the gear to the other side of the unit (snaps in and out)
-size
-doesnt require any screw drivers for mounting, changing orientation, etc.
-mounting is super quick and easy; can flip upside in seconds (the only arguable disadvantage is if you need to mount to a dogbone or something like the preston mounting congiuration, youll have to get creative, but i have never had an issue)
-package comes with all sorts of gear sizes as well as collets for 15mm and panavision size (the motors are standard 19mm)
-quiet
the only advantage preston may have its that their beefiest motors probably has a bit more torque, but i never had an issue. ive owned 6 hedens i believe. i dunno what your kit would be but i carried 1xM26 and 3xM21 but that LM30 looks rad.
total disclaimer - i no longer own them because i sold off all monitors, wireless, and fiz units because i like buying remote heads and rigs
brett.