Wellp, the F1 is definitely a class act. Only thing I didn’t like was the greeniness of the beam, but the styling is fantastic, the O-ring-sealed ring over the usb port is a top-notch idea vs the typische rubber-plugs that can pop off, pull out, get lost, etc., and the crisp rear switch has a nice solid feel to it.
The UT20 has a forward-clicky switch (momentary on… <drool>) and battery-status indicator in the switch that I’ve really come to appreciate.
Both have a great UI with no blinkies getting in the way. Ever.
If I were you, I’d just get both. 