This is an incredible product: genuine valve drive in a portable pedal for a very reasonable price. But for best results, definitely upgrade the valve, and add EQ.
I have 2 of these, one with a JJ 5751 valve (~70% gain of a typical 12AX7) which I use for crunch/OD, and one with a Tung-Sol 12AX7 which works as OD2/full drive. I stack them on top of each other for a juicy, high-gain British lead sound.
The factory valves in my TC Tube Pilots were a Bugera 12AX7C (bought a few years ago) and a Bugera 12AX7D (bought last week). These are often the standard preamp valve used in small Bugera lunchbox amps, so... they are not bad, but they are not great. I thought they sounded quite dry and fizzy, especially without EQ.
The Tube Pilot has just 2 controls, volume and gain. This means out of the box, the unit can sound quite disappointing - a bit lifeless and flat. A solution is to add EQ, either from a pedal or maybe a multieffects unit, and the tone suddenly comes to life just like in a combo amp. There are 2 similar pedals to the Tube Pilot which have a preamp valve and EQ, the Behringer Vintage Tube Monster and the acclaimed Butler Tube Driver, but these are very large and the Butler is (for good reason) quite expensive.
The build quality is very good. The casing is a very solid tank, and the dials have a satisfying feel to them. That said, the kickswitch is odd – when off, it turns on when the switch is *released*; when on, it turns off when you *press* the switch. This might bother some but not others. I'm sidestepping the issue by using a loop controller. The current draw is 400mA which is quite a lot compared to most pedals.
Conclusion: Upgrade the valve and add EQ, and this is a cost-effective way of introducing awesome valve sound to your portable pedalboard setup.