I can't use leccy shavers as I just can't get a close enough shave, (and I've had good 'uns too).
I stick to Mach 3's as anything else I find causes a rash
I basically only shave once a week, but if I've got a meeting in the week I'll usually make the effort and spruce myself up.
I have a full beard anyway, (all be a closely trimmed one), so there's not a lot to shave therefore blades last me a fair while.
I should probably change them more regularly, but the price makes me