For little over £20, there is not much to complain about with this Vintage Tremelo pedal from Harley Benton.
Firstly it is built well. Like most of their pedals it is housed in a strong metal casing, with tough plastic knobs. This one looks cool with a bright yellow appearance and a meaty dog on the front. My only problem with the build of the product is the power connector - sometimes power will cut out and I will have to rejiggle the connection - it feels loose inside the unit and is the same on my Vintage Phaser pedal.
It sounds pretty good. No complaints from me for the price, but I have heard better tremolos, and I have also heard worse.
The features the pedal offers are a bit minimal however. You can only alter the intensity of the effect, and the rate of the effect. There is no option to alter the waveform or style of the tremolo effect - however this may or may not be because the unit is based on a particular classic tremolo pedal which did not have these features.
All in all, for the price you pay, it's a good pedal to add to your collection!