A while back I purchased the E.L.F. version of the Nars Laguna bronzer/Orgasm blush duo after reading that it's extremely close to the Nars version. I used it a few times and I thought it was okay. It wasn't very pigmented.
Recently I just purchased the Nars Laguna bronzer and the Orgasm blush. I LOVE them and while the ELF versions colors are VERY close to the Nars version, the Nars version is more pigmented and prettier. The ELF version is $5 I think. The Laguna bronzer is $33 and the Orgasm blush is $23. For those of you on a budget the ELF version would be better for you. If you want to splurge on yourself though, I'd say go for the Nars.