I don't personally think your choice is the route I would have gone. I think the functionality it provides is good, and no doubt it is far more flexible and expandable than a solution from a major ICE manufacturer.
The Sony, seems to be a much more well rounded solution in the way that appears to be a polished proprietary solution and has a Tom Tom, which would be a massive USP for me.
The Tomtom was previously a massive draw but thats before I seriously considered a unit like this. Remember - you can put Tomtom on this if you wish, and from using it I'd rate iGo at least as good as TomTom. Which goes a long way to defeating the main advantage of the Sony.
However, the dealbreaker for me is the pricepoint. I don't think I could drop that much on a chinese unit. It's a ridiculous amount of money for it.
Yea, the price is annoying. Effectively I've rationalised it by saying I've bought a £300 unit and paid £300 for the OEM look, fit and integration level. Which still doesn't rationalise it, but there we go. You cannot escape the fact that due to a complete lack of alternatives on the market, it is overpriced.
But this was never a money saving solution - none of the 3 options I originally considered were cheap anyway. I wanted an integrated navigation system and was happy with quite how much it would cost to get that.
I can, however, sell my Intravee setup for at least £200 taking the net upgrade cost down.