As per the other review, this could have been a great device. When it works it's great, but every now and then it plays up leaving you frustrated.
First off, the instructions aren't very comprehensive. If you know how to work a PC you'll be able to figure a lot of it out.
The gps lock can range from a couple of seconds to a few minutes, but once up and running its fine. The device feels solid, but the screen is a bit small.
I've used this mountain biking and hiking. You can't follow it as clearly on a bike as you would a satnav in the car, but its easier than an OS map. I've had no problems scrolling the screen with my finger wearing a light cycling glove. To access menus you need the stylus, but once following a route you don't really need to do so.
The biggest drawback is that memorymap appear to have stopped providing support for the device, and are focusing on the smartphone versions. If you want help you have to go onto their forum and see if a fellow member can help.
After two years of fairly trouble free usage its beginning to get more temperamental, but at a discounted price, and if you don't demand too much, the Adventurer 2800 could work for you.