I like the move. It was a fair trade for both parties. Soria has put up great numbers this year, though some of his peripherals suggest he hasn't been quite as good as his numbers show (he's been very lucky on strand rate and batting average on balls in play, but unlucky in home rate on fly balls). Regardless, a top 4 out of the bullpen of Melancon/Watson/Hughes/Soria is much better than Melancon/Watson/Hughes/Bastardo.
As for Jones, he was a decent prospect, with the potential to stick at SS. But the Bucs currently have Mercer and Kang at the MLB level, and a couple top prospects in Cole Tucker and Kevin Newman behind him in the minors. So they really had a lot more middle infielders throughout the system than they need, Jones was a luxury (and if I were to choose a guy I'm willing to part ways with, it's a guy who struggles with his strikeout rate like Jones has).