Hello Robby,
I think there are only two to choose from: Raymarine and Simrad. I have the former. There's not a lot of difference. The Raymarine has a display, which is useful to confirm it's in the mode you think it's in. It can also take a NMEA 0183 input from a GPS to allow it to steer to a waypoint, if you like that sort of thing.
I gather neither are properly waterproof and so should be protected from rain and spray (amazing, isn't it?).
Apart from that, it's an excellent device and, obviously, especially for single-handing.
Anthony Russell
235/02 Sea Wyche
Anthony Russell
235/02 Sea Wyche