I wish Secrets was around when I got married 4 years ago (they didn't have one near me at that time) because I would have very much considered getting one from there - DH and I also said he may get me one for our 5 year anniversery next year if I wanted to.
When we got engaged, we got the ring that we could afford at the time. Its a really lovely ring, about 1/4 of a carat, but I got it from a large retail store and I can see some small flaws with it. It doesn't help that DH's cousin proposed to his fiance only a year later and bought the EXACT same ring from the same store
tarnished it a bit for me (and yet they claimed that it ruined their moment - even though we bought our ring first?).
I think they are absolutely gorgeous rings in Secrets and I really don't think anybody would be able to tell the difference - and they need not know. It's all about the couple's budget, what kind of ring they see as being their "dream" ring to go with that budget. I think some of the HUGE stones are a little tacky, and don't look as real, but certainly alot of their rings are gorgeously cut and I would feel very lucky to get something from there. I got my wedding earrings from there also.
But, whatever floats your boat. Personally, I would prefer to spend the money saved on a large real diamond on a deposit on a house or something similar. But it is all about priorities.