I use a Gilette Trak 2 handle (have one for home and one for travel, which I do a lot - bought the second one as NOS from ebay) and generic Walgreens or Walmart double blade refills, since Gilette does not seem to make original Trak 2 blades any more.

I get at least 4 weeks out of one cartridge/blade. I have found that a) one's face gets used to a certain type of razor and 2) when I do finally change the blade after about 30 shaves, it takes about 3 shaves to get the new blade "broken in". It doesn't feel exactly right until it's worn just a tad, or the anti corrosion oil is worn off, or something.

I tried my son's 5 bladed razor, the name escapes me, and holy crap was that a different feeling than my 2 bladed thing. And the cartridges are hideously expensive, locked away in a cabinet in the stores!

Rgds,
Chris W.
no electrics for me