For this module I searched PubMed, CINAHL, and Google Scholar. I have not used PubMed much because I always found it difficult to use. With the tutorial I had more success but I still struggled with exporting my citations into EndNote -- but I did manage to do it (Yeah!). I've used CINAHL often and I am able to find relevant data when I do my searches. It is also very easy to export citations to EndNote through EBSCOhost. I've used Google Scholar quite often. I find it sometimes gives me a good starting point when I haven't quite decided what I'm looking for.
Pub Med: Once I set some limits for my search, most of the articles were relevant for what I was looking for. I then searched using MeSH terms, this narrowed my search a little more, it didn't really change the amount of articles that were relevant for me. I'm still pretty uncomfortable with PubMed - so I need to practice more.
CINAHL: This was quick and easy for me since I have used it so often. Most of the articles I found were relevant. One thing that I really like about CINAHL is you can select "peer reviewed" as a search criteria, of course - everything is PubMed is peer reviewed.
Google Scholar: As I already said, sometimes I like to start with this when I haven't quite decided yet what I want to look for. You do get an overwhelming amount of results quite often, but I usually only go through the first 10 or so. This is usually enough to give me some good ideas on where I want to go next.