The floaters definitely feel thicker and bulkier as they aren't as segmented around the shoulders. I forgot to measure the thickness between the two before I shipped the 18 to the new owner. The arms were a little stiff the first period of play but after that it felt a lot better.
After getting to use this thing I can say it fits bulkier than the 18. My only gripe so far is that the wrist straps are nylon with not much room for adjustment as opposed to the old elastic one.
For those interested, the qmss2 is adjustable internally now as well. Instead of being sewn in like the axis 2 and ef6, it velcros to the internal calf strap and can be adjusted internally and externally.
I'll post the arms side by side later. Im at my full time job until tomorrow morning. But these aren't special orders so not available without the additional flap.
Fit for fit to the 18ab is the same. Though the new unit has a additional 4" of soft foam sewn to the bottom of the abdomen , like the removable part of the ef6 chesty (not removable on pro spec).
Here's a little side by side comparison of the older ccm ab18 pro chesty and the new ccm prospect chesty. I purchased this yesterday at work so now I can talk about it. The units weight is almost identical.
The floaters in the new unit are not as segmented and are stiffer, they also seem thicker. I'll get measurements when I can today.
The abdomen seems similar but the new unit has the air mesh from the ef6 which I hope gives better breathability and cooling. The backplate is a soft perforated foam and is lite and flexible .
And the arms are almost identical to the older unit. They did however tie in the elbow cup to the cuff strap.
Well now that it's officially in my possession after a day of poor financial decisions. It was $750 USD. I'll be doing a side by side with the older pro spec ab18 when I get home.
It's weird seeing them list the maxcore as a x-stiff core compared to the new core. But the xf is a single internal/no outer break pad. I haven't seen any in person so I'm just speculating at this point.