I posted earlier about how I'd managed to screw up my 055 and in the absence of anyone else ever having had the same problem, I took it to the Rapid Prototyping guys on our camp, who are literally geniuses in engineering and designing battlefield solutions to problems. They got me fixed up, but the big bonus came when they handed me a complete 190 that they'd dug out of the salvage yard. It was in the trash on the way to be shredded and figured I may be able to use it.
SO, not only did I get my 055 fixed (for free) but I also ended up with a free 190. If I can help anyone out with a direct side-by-side on anything let me know.
I can tell you that playing with both of them, the 190 is the one I'm carrying with me, period. For shooting partially extended, say from a kneeling, I don't see a reason to tote the 055. If I were going to be shooting primarily standing, or leaving a heavy rifle clamped into it at a standing height for long periods, it would probably be worthwhile to hump the 055.
I will add though, that the twist-lock on the 190 legs are a step-down from the lever-locks on the 055. In terms speed of deployment and stowage, and ease of use, the lever locks are the winner.