I tried CM10 and Slim JB, but while the increased app compatibility is clear and you can repartition them for even more space than stock... I just prefer GB, not to mention the camera sucks compared to Sony's.
Motorola International 8700 (first phone sold in Italy to send SMS) [half bricked] > Acer ? [returned] > Siemens S35i [good] > Samsung SGH-? [stolen] > Nokia 3220 [mostly still OK] > Motorola RAZR [still OK] > iPhone 3G S [2 batteries worn out] > iPhone 4S [I gave up after iOS 7, still has 10 months of warranty] > Samsung Ace 2 i8160 [won at Samsung giveaway, still works fine, CM10.1] > Sony Xperia U [modified Sony 2.3.7]