Hmm. Have paddled a V10 Sport Ultra a number of times and currently own a Huki S1-R and a Synergy Lite. Comparing the Epic and the Synergy, I'd give the overall nod to the Sport in stability and probably paddling position. It's close though. The Sport is not as stable as my R, either. That said, on a downwind, the Synergy literally flies-it lifts off on the slightest swell and just goes, and the stainless cable steering setup has none of the mushiness of Spectra/Vectra cable boats.
The Synergy is an interesting boat in that it feels like it needs to get up over a certain speed (6.5 mph or thereabouts) before it hits its stride. Overall, I'd say the Synergy is faster-the Sport (and my R) hit a wall and the Synergy definitely has glide beyond that. I've also owned a Legend and two V10Ls, and purely on the flat, I'd say the Synergy is closest to the speed of the Legend. The V10L feels (and likely is) a bit faster, but in confused chop, I'll take the Synergy. It has crazy secondary stability, similar to the Sport in this way. If the wind is at your back, prepare for a whole lot of fun-it rips in a following sea.
The higher side rails of the Synergy make it more difficult for me to remount than the Epics. If you're comfortable remounting in a Mako 6/Elite, it's probably on a par with these. As far as build quality, I'd agree that the CC boats are a bit heavier, but also designed that way to withstand the rigors of SA surf. Had a Mark 1 way back that was bombproof. Could be that yours had a flaw in manufacturing, the conditions were just right/wrong for the unfortunate to occur, or maybe the seams were prestressed (popped) from cinching down with straps? Have seen this happen on some boats where you can just make out a hairline crack on the seam line- 'v' style carriers are so much easier on our skis. Sorry this happened to you.
Will be posting a review shortly on
www.surfskiracing.com. Keep in mind that we generally see much smaller conditions in the east coast of the U.S. than Rob encountered when he tested the Synergy when it debuted. Looks like he had a good time. ;)