I can throw my two cents in on the SEL Ultra, having owned one for about a year and a half. Here in lower New England in the US, we mostly see confused washing machine chop, as opposed to big swell conditions. I found the SEL to be brilliant in these conditions-supremely composed and invited the opportunity to put the power down. The Ultra layup is stiff, crazy light, and exceptionally beautiful. Our runs are short, stacked, and steep, and the feathery weight allowed easily dropping in with a few, quick paddle strokes; it was a treat to pop up and over into the next run. On some boats, it feels as if you're clawing your way over-not so, the SEL, it hurdles them.
Other positives: surfs quite well, sitting nicely on top of a wave, good turn of speed (a bit off the V12, and certainly the 14, Elite/Glide, SES, etc.), but definitely competitive with the front runners. And did I mention stable?
3 point footplate is a rock-no creaks whatsoever. Aesthetics notwithstanding, I loved looking at this boat-just flat out sleek, and at 22-23 lbs. a delight to transport and accelerate in a sprint. For me, the seating was fine. Interestingly, about this boat-it's billed as an low volume model, but unlike other 'true' LV skis (V10L, Spark, SES...) it's very accommodating for bigger individuals. I also owned the SE for a period, but even at my 210-220 lbs., the SEL just fit better. The nose will bury slightly in steep stuff, but immediately pops up, very controllable. The secondary stability is very linear-it just builds and builds, until you're thinking, "I'd have to do something really stupid to fall out of this boat." Plenty of feedback before a swim. Goes nicely straight on into the wind. Outstanding paint and finish/detail. God, it was beautiful.
What I didn't like: horizontal foot plate tracks force a wider footwell, which isn't a bad thing for winter neoprene footwear, but also forces a wider catch. You acclimate, but it would benefit from cutaways. Space forward of the footplate is cavernous; unless you fill it with minicell, etc., it holds a whole lot of water on dumping waves-venturi clearing is just adequate. My largest complaint with the SEL was its difficulty turning in high wind conditions. I don't know if it is rudder placement, rudder design, or pilot skill (or lack thereof), but in strong winds, I could not turn this boat. Switched to Q-Power line, and all the Stellar owner tricks (backing plates behind the pedals to prevent line slippage, etc.), but steering was always somewhat slow and unresponsive. The surf rudder helped minutely in such conditions-tracked better across a wave, but you could feel the drag on the flatter bits. The tradeoffs, IMO, were not worth the small amount of 'bite' returned, but again, we don't see big swell as some of you do.
'Hope this helps. I know Wesley has the Ion, and is working on a review of that one, so stay tuned.