Depends on your use case. If you just want better sound than your TV and you’re not fussed about the best quality sound why not go for this? Sound is subjective and there are people that wouldn’t rate Sonos. Best thing would be to experience it first before buying.
It's amazing how badly the Meridian (once at the top of the audiophile world) and LG relationship has gone. It's not helped either of their reputations. Apparently this year's soundbars are much closer to Samsung though. Even so £63 is a bargain and the reviews of this model are pretty good. There's no way your TV speakers will sound this good. Maybe the top end Sony OLED but that's it.
LG soundbars are generally very poor. Don't be surprised if your TV speaker is as good as this. Save up and go for a Sonos. I was given a LG GX (£1000) soundbar for free and I regret selling my Sonos beam.