I've rode dual rates with and without resi's and triple rates without resi's. I havn't tried anything but works on my banshee then I bought my 450 new in 03' which has TCS now..
Got a set of dual rate works sitting here now.. I have to rebuild them though... Bladders are junk.
Air struts FTW!!
http://i78.photobucket.com/albums/j102/fouledout/IMAG0456_zps0476a3bc.jpg
Edit: forgot back in the day I tried some progressive suspension.. Got a banshee in on trade when I worked at the dealer... so i took them for a weekend.. They sucked.