I bought this to transform my oyster pushchair into a travel system. I had 3 options, the britax, the maxi cosi, or oyster's own. The oyster one didn't seem to be superb quality to me, so I had to choose between the other two. I decided to go for this one as I didn't want to spend too much on it as I was also getting a base to make life easier. The Oyster is very customisable, adding all the items I was getting, it would come to a lot! I have to say I did not regret my decision to go for the britax.
The car seat is beautifully made, simple, stylish and what's more important, very comfortable (good padding) and sturdy. You look at it and see it's good quality. My baby seems very content in it, sleeps on it soundly.
Another reviewer mentioned it does not protect baby from sun, but none of the others do cover them enough. I got a shade for the car and a parasol for the pram (it's also used when baby is in carrycot, by the way, it's not only the seat fault).
Even the royal baby left hospital in a Britax! (So Mothercare told us on facebook) I guess you can rely on Britax to be a good choice. There's an improved, more expensive version of it (SIIR) but I think this is one is good enough.
Also, if anyone is interested, I got the belted base with is very good quality, you even forget it's not an isofix. It doesn't move at all, stays perfectly in place, if you don't want to splash the cash on an isofix base, I can assure you the belted one is really good too.