I obtained a Keller HD5 power hacksaw for a song, and it is a wonderful saw, especially when cutting thick bars. Just set it and let it go, it shuts off when the cut is complete. Blades seem to last forever! It does not work so well for small stock, as it seems that a smaller saw would be a bit more efficient. Being large and heavy, it stays out in the garage and gets used more for cutting stock for welding projects, but I am considering building a small benchtop sized power hacksaw that uses regular hacksaw blades. A small saw like that would work nicely in my basement shop.
As for cutting speed, yes, bandsaws are faster, but waiting for the saw to complete a cut is the perfect time to stop and enjoy some coffee, especially while watching the hacksaw do its thing. It action is rather theraputic! Oh, and of course everyone that stops by and sees it work thinks it's just cool.