Just the other day, I had a job requiring a solder sucker. I removed about 20 components with 14 thru holes leads. I did roughly half with each of my suckers.
Between my "Edsyn Soldapullt" (actually an OK DP-100 Soldapullt clone) and my new-er Edsyn Soldapullt 3, I have to say I preferred the Edsyn Soldapullt 3 for this job. The spring is easier to set*, which starts to matter on a bigger job, and the results (in this case) were the same (excellent).
But I think the original has a little more observable suction. AFAIC, it's what other solder suckers should be compared against.
*It starts out a tiny bit easier, and I also removed the spring in the Soldapullt 3 which pre-extends the plunger stick. Due to the design, the sucker doesn't feel like it's pounding itself to death with this spring removed. (There's some friction in the 3 design, which prevents the plunger stick from retaining maximum velocity all the way to impact).