The S370 can be had for under £90 these days (plus it's discontinued now), so I highly doubt the rest of the system represents £210 worth of value. It'll comprise of tiny basic speakers and a lightweight, half-hollow receiver unit just like every other system in this category.
I had a similar Samsung one before my current Onkyo set-up, and they're so different it's not even funny. The Onkyo actually looks, feels, sounds and behaves as a proper piece of audio equipment, whereas the Samsung was a horribly cheap looking thing in comparison, and lacked even some very basic settings.
If it was £200 or thereabouts for the Sony one, I'd agree that it might be a decent shout, but not for £300. For what you actually get, it's not a fair price.