Started with a Quest 451, then Quest 559. Still have both of them. Now riding an S40 since 2023–great ride. Wouldn’t consider going back to a wedgie (diamond frame). The advantages so far out weigh any drawbacks for road cycling. Add the moving bottom bracket, adds to the learning curve, but it’s well worth it to feel your leg power driving into the front wheel, nothing like other recumbents or diamond frames.