kCross and agentblue , both of ye have the 330, I am about to purchase a 320.
My lawn is much smaller than ye have only approx 1000m2 , so the 320 which can do up to 2400m2, sounds fine for me. Other than the GPS and the 2 guide wires, which , because the area I have is much smaller and fairly straight forward, I don't think I need, is there any other reason you think I should go for the 330 over the 320 ?
The price difference is €500, but if it for the features I mentioned above, then it's €500 in my pocket. If it is for better build quality, more robust parts, motors etc, it might be worth spending the few bob more.
I haven't seen these machines side by side or in operation, so it's hard to compare.
Any advise welcome