I've owned two Garretts, the last being a 250, and did not like either machine. The signal and tones tend to bounce all over the place when an object does not neatly fit into the segments. Battery life is okay, but not great. The coin tone...some people love it and some people hate it. I'll admit I was really disappointed with the 250 after reading so many great reviews here on TN. The 350 has a different coil than the 250 and I believe it's the same coil as the AT Pro.
As far as White's machines, I've owned several, and they are solid, deep machines. Except for the Coinmaster series, they tend to be heavier than most machines on the market. The higher end machines have great programability and tons of preprogramed options. New or used I find them to be great machines.
BUT I love my Tesoro. It's light-weight, one 9-V battery lasts and lasts and lasts. Yes, they are primarily beep and dig machines. (Their coin machines are they exception in that they do have a display.) This is not a disadvantage. My ears tell me tons from the signal. For example I often get a better, brighter signal from a zincoln that's at the same depth as a clad quarter. After digging multiple pieces of chain link fence at a park, I knew what they sounded like. By upping the discrimination and finding where a target drops off, I've been able to tell if a target is can slaw. Though complete soda cans won't discriminate out. I rarely have to use the pinpoint feature and can pinpoint very tightly.
Every brand has people who can't imagine better machines. For $500 you will get a lot of machine from a Tesoro. Best luck whatever decision you take.
