As it says....

I'm thinking of getting a GPS for a few reasons. One being that my spedo isn't very accurate so buying a GPS will save fixing it.

Has anyone got one or had any experience with them?

a gps wont fix your speedo problem. i'd probably recommend not using it as a speedo either coz the screen text is quite small and trying to read it at 100km/h is probably not such a good idead, also considering that it won't be in the factory cluster area too.

but other than that if you can afford one then go for it. i got one in my car and it's saved me plenty of times. i've installed a few and they've all worked well. accuracy is quite good