ok update.
I suggest that this be anyone's FIRST festool purchase there are other good 5" & 6" sanders on the market and you can buy a Mak rail saw and get the same results, it isnt the "game changer that the domino is but there is nothing as uniquely versatile as this sander. 3 modes, 5 functions in the smallest format on the market. It is Cooler than the OF 1010 (to me that is the greatest complement i can give a tool.) The RO 90 personifies my tool philosophy of carrying the smallest lightest tool that will accomplish 98% of my tasks.
modes/ functions
Rotex / Aggressive rotary sanding & polishing
Random orbit / fine sanding
Deltex/ detail & "jitterbug" sanding
so after going back and picking up over $200 in abrasives & accessories I am becoming fully Invested-err Equipped [eek]
My wife commented that it looked like a Scrub Buddy this got me thinking about a 6th function Grout residue scrubber I deal with full acrylic grouts that SUCK to clean
the Viles sample backing quickly fell off which revealed a brand new unworn side to use [big grin] I looked up the price of Viles 10 for $16 [eek] so I am experimenting with a different spiked "velcro" on a soft pad to stick scotch brite style pads directly (this is a much more cost effective solution to tough "scrubbing" cleaning tasks) will post info when i find the best combo.