There is a very big mechanical difference between the handy and the Keon, the handy is so much better in faster parts / following the script it's not even close (I have both and I never use the Keon for that reason (event though I would love it for the fleshlight support)). The difference is appareantly even bigger for the OSR2+ and SR6 (even though I've never tried). I think that should be added to the comparison. Especially since the SLR will probably be better in that regard too.