To answer my own question.
I checked it with different dealers and experts, and all of them told that if I want to use it on regular basis, I should consider inflatables as toys. Also here in Switzerland it counts as flotation device and is not allowed more than 150 meters offshore. I bought myself a hardshell kayak for about 300$ more and next Monday I will paddle the first time to work. Let's see how this turns out.
It's been now 3 Weeks, my hands are a bit sore, i lost 2kg, and i'm feeling better than ever.
I was lucky with the Weather so far except one little storm, which was pretty exciting and gave me a good adrenalinerush.
I can store the Kajak at the shore, because pretty much everyone was so excited to hear that i'm commuting with it, that i even got a place for it with a roof for free. If it happens that you'd be able to commute by kajak, do it! It's the best anti-stress activity ever. It takes me around 5 minutes to get it in/out of the water and crossing the lake is another 15-20 minutes.
The equiment i use right now
- Paddlefloat for emergencies
- Waterpump for staying dry when a wave hits me
- 360° Flashlight for visibility
- Headlight for additional visibility when it's dark (sometimes i work until 10pm so it helps me get the kajak ready too
- Crewsaver Lifevest
- Werner Carbon paddles
- Wheels for easy carrying
- Splash protection (you'll definitely need that if you want your pants to stay dry)
- Lid for storing the kajak and keep it dry inside
- Security/Tow-line to prevent the kajak from floating away in case of emergency
Here's a Video of my morning (around 7:00 am) http://www.youtube.com/watch?v=tMqGc2NtMiQ&list=UUryTnpRnJxvnyXGMTRe6Mvw