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
Bought a drysuit for winter, since the water got very cold and if i'd fall into it, i'd have less than 5minutes to get back in before having no more power left and drown.