In reply to Dark-Cloud:
I've got a 6X its a very capable bit of kit.
It's worth knowing that the 7 is expected literally any day now.
The upgrade from the 5 to the 6 is fairly noticeable, the bigger screen is pretty handy.
But the 5 to the 7 is likely to be a very significant upgrade.
It is expected that the 7 will have a very good battery life and even better solar, but the 6 is more than capable of covering most ultra distances. (I think upwards of a day GPS time)
The 7 is likely to be a big wedge of cash, there are some very good deals on the 6 at the moment.
If the spec of 6X ticks your boxes, now is a cheap time to get one.
if you want the latest and greatest, and have cash to spend, I'd sit tight and check out the 7