The 23andMe & then in early September I did Ancestry. Between the results of those two tests, uploading my raw data to a few other free (or cheap) genealogy sites, the 'non-identifying' info NY gave me, my knowing my birth name from my adoption legal decree/name change, some helpful 1c1rs (1st cousins once removed) and a lot of detective work by my eldest daughter and I... I now not only know who my birth parents were (sadly both deceased) with 95% certainty but know I have half-siblings (I'm not sure if I'll ever meet but they're there.. lol) and I have quite the family tree growing and some of my ancestors stories are being revealed. 
For an adoptee especially DNA tests 'can' give us some answers and, if we're very lucky, a degree of closure. 
If you're really into genealogy I'd highly suggest taking the Ancestry one too at some point. IME the 23andMe was a good start for knowing my genetic (incl Neanderthal) heritage (and mostly because I got my raw data downloaded and uploaded to other sites) but they don't offer the ability to build a tree and I got more hits and info on Ancestry.
Oh and HAPPY BIRTHDAY! 
If you need any tips like on good sites to upload your raw data to omg me know. DUs Ancestry/Genealogy group is also excellent. 
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