ljcox said:
Have you tried cutting a large PCB on it, mine is 300 x 300 mm (about 11 3/4 inches)?
I've cut 1/32" thick paper phenolic 12" x 18" (304.8 x 457.2 mm) board no problem. I've never cut larger than a 4" x 6" FR4 (1/48" or 1/64" thick) board. It does leave burrs along the edge of the copper at times, but it's quite easy to fix up with a small file. I would assume that most methods leave burrs, though.
When I started using the transfer method for making PCBs, I liked the thinner boards better because they went through my laminator better and were easier to cut with lineman shears. I purchased a large bulk of 4" x 6" FR4 (at 1/48" and 1/64" thick) and still have plenty, so I've never had the opportunity to cut anything larger until I started using the paper phenolic boards. The paper phenolic isn't as strong as the FR4, but was made specifically for classroom use and, furthermore, ease of cutting. It can be cut using a large pair of scissors quite easily. Just watch out for humidity when using the paper phenolic boards as it tends to make them delaminate.
I originally got the idea of using a guillotine cutter from a website giving instructions on how to "make your own PCBs at home". I cannot find the site now. If I remember correctly, they were using 1/32" FR4 in 8" x 12" sheets.
I don't see why anyone would have problems cutting anything up to the width of the board. I would think board thickness and material would be a bigger consideration. I, personally, wouldn't cut anything over 1/32" thick, especially FR4. Honestly, I'm just guessing and perhaps someone else has more experience with cutting something bigger/thicker.
I cannot comment on how long the blade will hold up. Mine seems to be doing fine, but I don't use it often, either. Only a couple times a month. I build everything else on perfboard.
For 40$ US, it was well worth the investment for me and does everything that I currently need. A more expensive shear would work better (and probably be a sound future-proof investment), especially for the thicker boards made of FR4. If you're using thinner boards or paper phenolic, then a cheap paper trimmer might be all you need.