The air bags are designed to fit inside the coil springs under zero load, so without the extra weight the rake is exactly the same as stock. The ride feel is directly influenced by your PSI setting, so the lower the PSI the more you'll bounce over bumps. I would think the bump stops would be unnecessary if you keep the PSI @ 30 or above, but certainly I wouldn't take that to the bank. I can tell you that you bounce more but not as hard with cut stops (which I have) so when you combine those with this air lift the ride is smooth as silk.
This may be the perfect way to balance the increased roll that blacksambo always points out as a disadvantage to cutting the stops.