I think more regular PT for Luna in Memphis would really help him. It would have been nice to stash him down there last year for that purpose, but the stupid Rule 5 rules wouldn't allow that. It looks like it's pretty much Alomar's job to lose as of now unless Walt's got something up his sleeve.
I don't think Luna is ready for a full time major league spot yet and I'm not really sure Hart will every amount to more than a bench player in the bigs. Overall it's a pretty good deal I think since $500k surely won't break the bank.