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I carried the PN-60w and associated version of SPOT on the CDT last year, so had quite a lot of experience with it --- the CDT is in general a trail where a person is more inclined to use a GPS than most. And I put a SPOT location on my trail journal twice a day.
Downsides:
I personally found that trying to get all of the CDT onto two separate SD cards to be a PITA using the DeLorme system; slow, geeky, problems along the way. The attempt at putting aerial imagery for along the trail --- which seemed like a great advantage --- was so slow and painful and turned up bugs. I never used it, sticking almost exclusively to the USGS imagery (which matched my paper maps) where I had guessed right about where the trail went when I was downloading stuff ahead of time. This shouldn't be as big an issue for people not doing long journeys, however. I just am not a fan, though, of the subscription model of downloading maps.
The software interface to load maps was something that I found really complicated. I used to be a software developer, so I usually don't shy away from software complexities. This was one of those cases where it feels like you have to take a bit of time to learn the specific mental mindset of the person who designed the Garmin software in order to get it to work. A lot of power at your fingertips, but too much of the associated complexity exposed in cases where you just want to do most-common tasks.
No touch controls, and yes, doing a text message is thus a little tedious, especially with the pretty limited character count per message. This was another good idea in theory that in practice I almost never used; I just really didn't have much inclination to send very short texts that took a bit of time and effort to send out. But for something important it's not that big a deal once in a great while to send one.
I can't compare battery life to other units; I used almost exclusively lithiums FWIW. I never kept it on for long at one time, with a couple "am I really on the right track?" exceptions. The SPOT device had really good battery life; I used it twice daily and didn't change batteries until well over halfway along, i.e., well over two months.
I'm not really a fan of pairing a dedicated SPOT device to this specific GPS. There will be situations where, owning a SPOT, I might like to bring it along but not bring this GPS (the GPS in my smartphone is typically plenty, the CDT was a bit of an exception). But this special version of SPOT requires the GPS to work for anything but emergency SOS signalling.
Upsides:
I loved the screen. I could see mine on sunny days, whereas a friend with a Garmin was always having to try to shade the screen so he could see anything.
It's a tough unit. Absolutely reliable over five months of continuous use. Very possibly saved my butt in a near white-out in southern Colorado. If not waterproof, then good enough; I did keep it in a kind of case on the shoulder strap of my pack, but not a waterproof one. The unit spent a fair bit of time being wet with no issues.
I felt that it locked on really well, have no complaints there. It can be nice to have more than one type of map to look at but again, in practice I rarely did this. In other circumstances I might.
Bottom line: if you don't mind the Garmin approach to buying map data, and you can manage to load maps onto your unit without too much tedium and frustration, I think it's a great unit.
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