One issue that hasn't been addressed ( unless i missed it when skipping all the non germane jig bashing comments ) is the importance of even clamping pressure. Both sides need to be tightened with equal pressure or the blade will pivot with the slightest pressure. This has caught me several times and even caused me to set the jig aside for a time. Once realized and accounted for the jig performs Very well.
And i agree, using adhesive backed sandpaper, 220 grit in my case, on the clamp bar helps prevent slippage.
For chisels, particularly narrow ones, the narrow blade attachment can be a big help.
Like most every other jig or machine this jig has a personality and once you get to know it you'll be pleased you bought it. I'll touch up an edge free hand several times, usually 1200 / 8000 diamond stone and strop before re-establishing a flat square edge using the jig. It takes less than a minute to clamp the blade and get to work on a stone and there's no need to clean my hands before getting back to work.
Brian
The significant problems we encounter cannot be solved at the same level of thinking we were at when we created them.
The penalty for inaccuracy is more work