Lehle Mono Volume

This volume pedal is the most solid piece of gear you will ever own. Therefore, it is really heavy, but it has fixing points (and included screws for pedalboard mount). Otherwise, comes with detachable rubber pegs/feet, and it doesn't budge on most floors - at least while playing sitting down.
Really smooth volume sweep, reliable and adaptable,as you can dial in different gain settings. The extra output is great for different setups. Sadly, still only used it in studio environment, but it seems very suitable for stage abuse.
Pros: smooth operation, it will NEVER break down, multiple setup options, buffered (which is good for long pedal chains)
Cons: weight, needs power