Just had an email back from SPOT which says
"The Spot 1 is larger, heavier, has a weaker GPS chip, but has been rated by some to be more reliable than the Spot 2.
The Spot 2 is smaller, lighter, has a stronger GPS chip (which means it will pinpoint your GPS location much faster), includes a 'Custom Message' feature, a 'Message Indicator' light, etc; but as we mentioned earlier some people prefer the Spot 1.
If we had to pick one we would say the Spot 2 because in theory it is superior to the Spot 1. In actuality, the Spot 2 is saving lives and keeping friends and loved ones in touch with each other just like the Spot 1, so it really comes down to your individual preference."
Has anyone any thoughts as to which is best - I lean towards the 2 mainly for weight difference.