I have been riding my two wheel Vison recumbent when I am up on Quadra Island. Its a completely different experince from the Borealis. It's taking some getting used to being on two wheels again. I have pedals that are a platform on one side and spd on the other. For my first ride I clipped in and road off without incident. I rode for about 10 km and then decided to take a short cut on a trail. When I first turned on the trail I thought about unclipping but the trail seemed pretty good so I didn't. Well not more than 5 minutes later I am laying in the bush clipped in. A sharp turn and some roots across the trial did me in. This may be a gentle message to get an upright bike for this sort of thing!! You think I would learn from this but on the next ride I again ended up on the ground again. This time it was just forgetting to unclip when I was going too slow and shifting on a hill. I was pretty casual about it not paying particular attention and just fell over onto the payment. I prefer the bush its softer. This would never happen on three wheels. I have noticed that I am more relaxed in the velomobile not having to worry about unclipping in time. While I am just as comfortable sitting on the Vision or the Borealis all things being equal I'll take the Borealis. I must admit that the Vision is still an nice bike in spite of being 15+ years old.
On a ride earlier this year I noticed that I was through the intersecftion(from a dead stop) before the roadies had clipped in. By the time they caught up I was already at about 20 kph. The hard part in the velomobile is the slower acceleration from the low-mid twenties to cruising speed. Its OK do do a few of these stop and starts on a ride but if you have very many it cuts into your average speed.