Update: I've had my B17 for about 400 miles, and after a couple very minor adjustments, I can say I love it. The longest ride I've done is 40 miles, so I can't yet say it's perfect, but I found it comfortable from the get-go, and moreso now. It's just starting to get the indents where my sit bones rest. I'm looking forward to finding out if it gets even more comfy.