Alex Smith's contract (cap hit-wise):
2015: $15,600,000
2016: $17,800,000
2017: $16,900,000
2018: $20,600,000
I went through their pertinent stats over the past 2 years in another thread, for comparison's sake.
Similar players, similar contracts. Completely lateral move in my opinion which means it's not worth whatever we're sending them unless it's just straight Tyrod for Smith. And in that case it'd just be a wash.