My husband LOVES the Mesivtas. We are building up a collection of them one volume at a time. I think we currently have about 30 of them.
He wanted a regular Shas as well because the Mesivtas don’t have the full set of meforshim in the back (such as the Rosh, the Rif, the Tosefta, and the Maharsha, as well as minor meforshim. My husband really likes the Ya’avetz and the Maharatz Chayes).
Oz Ve’hadar also produces an expanded version, which includes selections from the Rashba and the Ritva (or at least this was the case several years ago when my husband was in yeshiva).