I haven't watched as much Serie B the past couple of years as I used to so I'm not sure how good his form has been but he was always fun to watch. Probably lacks the quality to excel against absolutely top level defenders so hasn't garnered a lot interest from Serie A clubs but he plays with a lot of flair. A lot of solid Italian strikers seem to develop really later on so he may have a few of his best years ahead.
The guy who made this video agrees: youtube
He also scored arguably the goal of the season last year: Antenucci Amazing Goal
I hope Leeds gets him. I've been following the news a bit since Cellini is, of course, quite a cult figure in Italy and so Leeds is getting a lot of coverage in Italian media.
I was hoping you guys would get Viviani on loan but I think the main unspoken thing that caused him to choose Latina was simply that Latina's a suburb of Roma and therefore has many close ties to AS Roma. Viviani's a kid like Totti, De Rossi, Florenzi etc who grew up a passionate Roma fan and has his heart set on making the roster.