I've owned a Koosah for about a month now. I love the thing. It is my first bent and it is such a nice looking thing. I never biked much prior to the Koosah, only once or twice amonth or so in good weather. I'm on the Burley nearly everyday and have built up to about 8 miles/day at that. I started out at 3 miles per day 4 weeks ago. Time, not exhaustion/fatigue, keeps me from going further. On the weekends when I have alittle more time I'm doing 12 miles and hope to up that to 15 this weekend.
At first I found it hard to go over 8-9 mph. Now I average around 14. There is one good stretch of flat on my trip that goes for about 3 miles and I am able to maintain 16-18 mph in that stretch. I love it. I think I could go faster, but have never ridden fast before and as such am a bit frightened. I am increasing in speed as I increase in coordination.
I've ridden it for a few hours in the rain and have found the ride pleasant enough and felt in control at the speeds I maintain, which is to say below 18 mph.
That said, I do feel the seat could use ALOT of improvements. My problem with it is two fold. First, I weigh only 134 lbs and am 5'4". The seat is very slippery. When I hit the bumps the bike literally bounces me off the seat!
Not Cool! I have learned that when I can anticipate the bumps--know they are coming--I can brace my legs and drive my bottom into the seat and not have such a huge bounce. The seat is slippery though and I find it difficult to keep from slouching when I have my rain gear on.
I also have arthritis in my spine and I find that Koosah's seat back a bit uncomfortable. I can feel my spine all along the back. I found this problem to be the case on the Rans Tailwind and the EZ thingamajiggy I test rode, too. So, I think that just might be something I will have to deal with myself.
Still, I feel my investment has been well worth it and the Burley has hooked me to bents. I know now I'm a bent freak and I will always be one.