Paul, great review with very useful detail. I'd just like to make a few points:
a. You didn't indicate where about you used the Neotel service from. If you look at the Neotel coverage map tool on the Neotel site, it will indicate what you reception will be (average, good, excellent). So it would be nice to know what rating you area so that one can put your download speeds in context.
b. I assume one can add an external aerial to the modem as one does for 3G routers, this increasing the speed. This might be of use for some people as it might result in a good speed jump for little investment.

I think you've done well to communicate that this is a good alternative for the 384/512kbs ADLS users which I assume most are. Also I think 10gb is more than enough for many average users too. The reception of Neotel service is the make of break issue in my eyes. Let's hope this gets better.