Summary

Something I love about Mendeley:
The use of 'tags';
Drag and drop, although information can be inaccurate sometimes;
Sync with BibTex;
Editting and making notes of PDF files;
Can open multiple windows to read PDFs;
Free!
Web and desktop versions sync easily.
Add 'Save to Mendeley' button is pretty cool.
Disadvanrages compared to Endnote etc.:
Can't choose the fields (e.g. url etc.) to output. Huge bug!!!
Seems to have fewer pdf files/full text files attached automatically-->due to worse accessibility to libraries?
Not much really...To be discovered