edit: look, a wall of text when it was suppose to be 5 lines..
The differences between SimBin and ISI approach to FFB is that SImBin uses grip. There is no such thing as "grip" FFB so it has to be calculated, it is artificial. I favor SImBin as there is one difference: while rF and rF2 both simulate the actual steering column movement, with all the proper torques that comes from changing geometries etc. it does not give you any "ass" feeling what so ever. SimBin used grip as way to give user some feedback. The second difference is mass transfer, which both uses but SImBin IMHO just managed to find better settings for it. Most of the difference is the total strength. In rF small changes in body roll are not so easily noticed but huge changes make your wheel go from side to side, very violently and unpredicatble way. Where as SimBin has a bit exaggerated "low end" and heavily limited "high end".
ISI approach is more "simulatory" and SimBin is more "artificial". SimBin is more playable (debatable, it does give you fine feedback, information a LOT more but since there are many channels, some are "artificial", it gets "muddy") But there is good news: the same .PLR file stuff is still there.. So each and every one of us can tweak rF2 FFB to suite SimBin drivers better. I got a decent setup in one evening where it started to be about what i want, which is very close to SimBin or Race07 feel. Only the body roll or should is say, extreme body roll was still pretty horrible but then again, driving a tin roofer FWD does not represent the Formula classes at all, i'm sure.. But it felt like useable, enjoyable even.
It is a lot better to what it was, small changes here and there (the graphics are VERY odd, i've seen screenies that are just beautiful, on my PC with max settings, it's still looks like crap...). One thing i do have to say: ISI is really really slow doing anything on rF2. I have wondered how they are still alive... They said it's gonna be slow but boy.. It should be a lot more ready, they are at least 1½ years behind schedule. But even if ISI goes broke tomorrow, rF2 is still worth buying. It is too bad SImBin is gone as the perfect game would've been ISI working on engine, SimBin working on the game (just think, clean, uncluttered UI, content that works, graphics that are great but not too much eyecandy, FFB that is tuned for driving a driving game on a computer, not on full-motion rigs..all backed by an engine that is brilliant.. what Race07 did to rF1, Sector 3 should do for rF2.. but ISI is way too proud and SImBin tried to take way too large piece of cake that they could not bake..They were modders, not coders..)