I bought a similar set from Lidl last year, and it's been great. I've put an uplighter near my TV on the dimming socket and another dimmer in the other corner of the room and my subwoofer and a fan to cool my AV amp on switched sockets.
Doing so allows me to dim/brighten the room for watching films, and instantly cut the bass from the subwoofer when watching late at night.
This year's set is £2 more expensive, but includes a two dimming sockets instead of one. The set also includes two regular on-off switching sockets and the remote.