Had the Fiskars sliding saw, same as the Gerber. I liked it fine. 3oz. weight disappears, and the $10 investment is minimal. I preferred it over other department store folding saws of similar. The "lock" is just a tension nut, so it may occasionally need some adjustment in use to stop from sliding around; no big deal, it's not gonna fold or anything. After upgrading saws, it saw (lack of) use in secondary kits that would just hang around, and I later stuck it in my partners kit at the time. The Gerber sliding saw I consider a fair investment; it costs little to buy or carry.
Raising your investment to $25 or so, is a japanese-style (pull cut) Silky saw. I use these now. I like the Silky SuperAccel 210 for the size-bracket, but the PocketBoys come with a water-resistant sheath/case, if you so desire. Compared to the Gerber/Fiskars sliding saw, they weigh about twice as much, but sturdier, and cut significantly better.
No experience, but the Bahco/Kershaw Lapplander seems rather popular with lots of bushcrafters, as well as having Ray Mears (bushcraft/survival instructor) seal of approval.