I haven't ever used or seen one personally so I don't know how well it works. If set up properly it's probably working fine and a lot better than nothing, but it's nice having gauges and really know what temps you are running at so you can make good use of your power yet know when you're getting too hot and need to back out of it.
Gauges aren't too tough to put in, I like Autometers and many put them in with the A-pillar mounts. There have been quite a few posts on gauges and where to install the pyro sensor in the exhaust manifold.
Vaughn