I like Vega. I don't know about their GWR, but I know on their clear air radar the diagnostic features are unsurpassed.
The unit internally can store time/date stamped event log (which will record when power was lost, or when it lost an echo), a trend (which can store 90 days of circular data), and can even internally store 10 echo curves (saved on event like loss of echo, or at a prescribed level). Data can be retrieved by plugging directly into the unit itself, or remotely over much slower HART communication.
Being able to pull a trend and event log from the electronics unit can prove it was not a bad connection, because the trend matches the SCADA trend. Being able to pull echo curves can show that product is bridging or ratholing, and it's not a radar problem.
I have also found their pre and post sales support good. They've bent over backwards to help us with our application.
Granted this was for a very difficult bulk solid application, and a water application should be more straight forward, troubleshooting aids are always good down the road.