I have decided to go the qstarz Q1000p route in the end, although it is a little more expensive. I will report back how useful it is in around 3 weeks.
My reasoning:
1) I have a GPS navigation device (non tracker, it links with my Mobile, which runs tomtom), this has had a minor over-heating issue, and is currently a battery taped to a PCB. The qstarz can replace this (according to the blurb)
2) I am going on two trips soon. The first will be my test-trip for the device, a week away. The second, will be a serious test, two weeks in america, including a cruise. I will not be able to access a computer, so the large number of waypoints will be useful (it claims 200,000, but at 1 point per 15s, for maximum 16 days [jet lag], that is 92,160 well within spec I think). I reckon 15s is enough accuracy, the first trip should let me know. I know someone who would be interested in getting a track done of the cruise itself. I am surprised that the gosget states ~90 days logging at the same time interval, somewhere there is some disparity as to what the systems can do (I believe that the 200k of the qstarz is Lat/Long, Altitude , so I am not sure how much less data it can log!)
I am of the understanding that the qstarz can charge and log at the same time (has a car-charger, what use would it be if when you plug it in, it turns off!), which, with a 32hour (stated, questionable) lifetime from a charge will give me the freedom to plug it in and charge whilst I am asleep.