my take on Air Ride suspension
Good
can raise or lower with a push of a button
those that have short inseams on full size dressers will love this
can adjust on the fly ride height (even though most recommend not when moving)
looks cool when you drive in to park and lower the bike (always attracts attention)
good for creating room for speed bumps
great for those that have a center stand and find it hard to set (raising the bike makes this a snap)
bike will still run if air is completely depleted (this is very important) now it may knock your teeth loose and for those hillbillies "tooth")
great for adjustment on various load sizes (no getting out that cheap ass hand pump)
can be easier to clean back wheel in the full up position
Bad
somewhat complicated install and not cheap (compressor install and wiring is the hard part, shocks easy)
you should install a pressure gauge for consistent results (I never got around to doing that and it would help)
for those larger than life riders like me it makes a softer ride and seldom bottoms out (hence lighter (normal) riders will find it harsh)
ride gets increasingly harder with increased height. (It is not supposed to work that way, but it does)
complicates a simple (stock) system (air lines, compressor. switches)
raises the center of gravity and changes handling with ride height (you can get yourself in trouble with the wrong setting by not paying attention)
running a stock shock with no air is better than an air ride with no air
you have to always remember to power up the rear suspension every time you ride (most system will not hold air long periods of time)
I have owned the Arnott system for several years now and I would say that in spite of some drawbacks I would do it again.
Once you have installed the system replacing the shocks is a piece of cake. So if you find a Monroe shock that fells better (or think is better) you only are another 50 bucks away.