Monroe GM Shock Conversion Kit

Has anyone ever used this conversion kit? It uses a shock/ spring combo as a replacement for the current air leveling system in the rear. I was wondering if anyone has these and will comment about how they worked out. Is there a down side to converting to them?

I did not buy this kit but I put Monroe SensaTracs and Moog Cargo Coils on my '95 about 5 years ago. They're wonderful. Still handles like new.

That sounds like just what I need. I really like the air shocks, but had to work on them last year and now, there is a leak possibly, but I can't find it. The compressor runs more than it should. I wondered if the car sits normally with the replacement shock/spring combo. Does it sag at all?