I almost bought a Marvel power hacksaw some years back. It was an older machine originally designed to be driven by a flat belt and had a clutch mechanism on it. It brought more than I thought it was worth for the wear it had, but I ended up with a Keller 5A instead. Very heavy machine, weighs around 400 pounds, but cuts straight as an arrow. Start it to cutting and do something else in the shop while it does its thing. Sometimes I just sit down with a cup of coffee while I wait for it to finish its work. It might not be as fast as a bandsaw, but the blades generally last longer and are not nearly as expensive either.
The only drawback is that it is such a big beast that it will be staying out in the garage when I get my basement shop done and get everything else moved inside. I am contemplating building a small power hacksaw for cutting smaller stock. It would use regular hacksaw blades and would only have a capacity of a couple of inches, but would be small enough to sit on a bench top.