"If you haven't bought one yet, please don't."
Unfortunately i have to agree with this statement. I have just sent Dension an email, hopefully they will be helpful with their response so my opinion may change.
Just a quick point...when i first connected my Dension kit up, i was impatient so i connected the black earth wire to a bolt/screw (it was a quick bodge of a job) - and im sure the earth fault impedence would have been very poor. I experienced problems with my ipod functioning, so i reinstalled it all.
2nd time round, with much better earthing (earth wire is now wrapped around a bolt in the glovebox - as described in another thread on SCN), my ipod works much better, but still havent solved the problems of skipping tracks.
Interestingly, i was able to control the ipod by using the ipod itself when i had the poor earth, now its connected to earth correctly, it can only be controlled via the HU. It may just me a coincidence (which is more than likely), but worth noting.
Let me know if you get anywhere with Dension/or fix the problems.
In the mean time, i recommened a good radio station
J