I bought a 230cm bent shaft standard diam carbon Kalliste and have used it three times. My go-to paddle has been a $60 Bending Branches Whisper. I bought the Werner because my wrists and forearms get sore. Putting many hundreds of miles on the BB this COVID year it got to the point where they would start aching in 5 minutes. I was surprised at how much the bent shaft solves the problem. I paddled 23 miles the other day and could have kept going except I ran out of daylight. Glad I bought it.
Cons: The blade is longer and thinner than the Whisper. For some reason I seem to get less power on a hard correcting stroke, even though the blade area is bigger. No faster than the Whisper. And the $490 list price, even minus the REI end-of-year 20% discount, is 8 times higher than the BB.
Pros that I care about: Easier to hold, the larger shaft diameter and bent shaft are terrific. Warm; the aluminum Whisper shaft is a big negative in cold weather padding. Weight is ridiculously light. The blade is curved, causing less splash for a dryer trip in cross winds, and you don't have to pull it up to get that extra flip of power at the end of the stroke. Oh, and the bent shaft means it doesn't roll around when you rest it on your cockpit rim.
Sizing: I'm 6'2", paddle an Epic 18X at 4.5 mph, and the 230cm length works well.