We’ve tried a lot of folding utility knives, and the Klein Tools 44131 is the best we’ve found so far.
Folding utility knives are a mixed bag. Many are poorly constructed, with flimsy locking mechanisms and mediocre ergonomics. This knife mostly avoids those pitfalls, offering a comfortable shape, sturdy construction, and very good fit & finish. Its locking mechanism is unique, and engages in both the closed and open positions; we have mixed feelings about this, but overall we’re happy with the design decisions Klein made here.