Jelmerfudd: Pitch and mod are a big plus, but main drivers are weight and relatively light action. I"ve got other widgets for software control, and everything is software, so I don"t need any controller functions.
Aellison: interesting! I"ve seen a number of opinions that the m-audio is 'light' compared to other actions, but there you go.
I do need to give the RD88 a go. It"s way more than I need, a bit more than I want to spend, and I"m not too hopeful about the action, but I may check it out regardless. I"m following the RD88 thread here with interest.
I think my favorite Roland weighted action was on the FP..30? Some model from 3-4 years ago. For me, played like buttah. I also recall the TP40 on the Kurz PC3X when I demo"ed that. I doubt I can lay hands on the SL88 grand, but if it"s in a similar league, it"s tempting.