Well, you're not going to hear anything but GOOD THINGS from this group!
The MGB is a classic sports car. It is fun to drive, fun to work on. Parts are easily available. Even someone with little or no mechanical experience (me) can learn to love doing stuff on it.
Properly restored and maintained, the MGB is as reliable as any vintage car, probably more so. I drive my 1966 B every day, spring, summer and fall. I have no qualms about taking it anywhere I want to go.
But it all depends on your level of interest and experience in keeping it going. They need love and attention. The longer you own and drive one, the better you'll get and listening to the car and knowing when it needs extra attention.
When buying a B, the biggest thing to be concerned with is RUST. B's are unibody construction, and one place they are prone to be rusty is the sills (underneath the doors.) If the B you are buying is solid, that's more than half the battle. Everything else is easily fixed. (All you need is time and money ...)