TBH it doesn't look particularly good value to me - not a rip-off, but not really a 'steal' as you put it. That is £1605 in sterling.
Although the total weight of the stones is 0.58 carats that is made up of lots of small and tiny stones, rather than say, three stones of 0.20 each, or one of half a carat. The bigger the stone the more you pay in terms of £ per carat, as they are rarer and harder to find in a decent colour/clarity. A big but poor stone can be broken down to obtain lots of useable, decent quality small stones, chopping out any unattractive inclusions or colour flaws.
Also, although the colour G and VS/VS1 is generally considered pretty good for say, a mid-priced soliataire ring you could argue that unless you are buying a solitaire, or a cluster of bigger stones it is irrelevant as you'd be hard pushed to spot an inclusion is a small stone anyway.
If you compare yours to this you will see that you could get three of those 25 point diamond rings for less that one of yours, and yet the diamonds are much bigger, therefore they would cost more per carat. Of course they are probably of slighter lesser quality of colour/clarity but you really need to be looking at stones of about 25 point plus, before that will make a huge difference to the naked eye.
Also you may be paying extra for an unusual design, so as always, the answer is if you love it and feel it is 'the one' then go with it. Don't compromise on what you love for the sake of a few hundred quid - it might seem important now but over the course of a lifetime you'll wish you just picked what you loved!