The tadpole steers so good an the "up front" feel of it is so good that I'm sure I'll get back around to them, but. My next project is a full suspension, recumbent, delta style. I love the handling, and the experience of a tadpole, but for a daily commuter, I think suspension is the Holy Grail. I'll be thinking about how to apply that to a tadpole (any details about how HPVelotecknics does it would be apreciated), but I know how I can do it Delta - style (and I have most of the parts).
An observation- Many people have talked about trying to build leaning trikes, I don't know why, I can take any corner on my highway at or above the posted speeds - 45 or 50mph (with the trike sufficiently tuned and geared (and I've been there)). Cornering is not the issue, I really only need to go about 35mph, and a recumbent delta should handle those corners at that speed. Comfort is a serious issue. Sometimes you want to just hold on and say "Here We Go", sometimes you just want to get home for dinner.
So, the idea with the next one is, how can I get home in 1 hour (33 miles), get a bit of a workout, and spend pennies on gas. Oh, and it should be something that amazes the onlookers.