The only reason I gave it a 9 is the packability. It comes with a great case for backpacking, but for kayaking you need to get a dray bag for it. It fits fine in my Tarpon 120's smaller hatch. I rigged a grab line around the zipper so it doesn't 'migrate' to the rear of my kayak in transit.
If you overnight kayak this is a must have on any list!!!
The first trip I went on I did not have the topo maps on my unit. The tracking worked as expected as well as the timing devices. The screen is not as big as a smart phone but it didn't take long to adjust to this size. After I downloaded the topo maps and learned the BaseCamp software, I planned the next trip on the GPS unit.
That trip and the trip afterwards were even more fun with the GPS unit. The accuracy of the unit isn't the best on the market, but for my uses the tracking was incredible. The other benefits of having the topos is being able to identify landmarks and features to help pinpoint your location. I often kayak with people new to the sport and the areas, so I am constantly bombarded with the "where are we?" and "how much further?" This helps me quiet those folks down!!
The final point that makes this such a great value is that it tracks moving time as well as total time. It has speed tracking as well. These features are helping me get a more efficient paddle stroke and it also helps me plan for longer trips with more efficiency.
In conclusion this is a high value low cost necessity for my kayak and I would recommend this to every one that owns a kayak or a canoe!!!!!
I did notice a slight difference in the handling of the 120 vs the 100. This is due to the additional 2'3". I use my kayak primarily on the streams and rivers in Missouri. The 100 was quite agile in tight areas and could be turned "on a dime". The 120 is still nimble, but a little bit more effort is required, nothing substantial though.
I am sure that I will be heading out again in the next few days!!!
This is a great vest, other than my silly complaints. It will float a 189 lbs. man in Class II/III water. I tested it. Also, Stearns is a time tested manufacturer of great products. I would say this is a great product and would definitely recommend this for a purchase!!!