Yes and no. It's certainly correct that the results these people claim on their site, can occur when the chip power is lowered and raised again (check this yourself by putting a dimmer on the cord of your own fruit machine.)
It's also possible that the control chip for the machines will be interfered with by microwaves, as they transfer to very low wattage electrical pulses when aimed at the chip.
What is unclear is:
Is it possible to direct the waves accurately at the control chip?
Is it powerful enough to affect it?
It wouldn't set any alarms off, but I suppose if it worked, which claimed 'effect' would it have on each give make and type of machine?
I'm 50-50 on this. The theory has a sound basis, it SHOULD work, but how often would a user achieve it?
having worked on fruit machines for a major manufacturer . it may interfeer electronicly as far as any electrical device may , but as far as giving credits etc the answer would be No
theirs more to fruit machines than some people percieve , both in their operation & operating sequences , and payout paramaters
No, admittedly I haven't seen the credits added, but I think thats the 'INFRARED' devices' claim, not the MicrowaveRF. I've certainly seen the 'odd' banks being created and repeatedly collected though, so although I cannot vouch for all the claims, that one seems to stand-up.
Anyway, it's all illegal, so one shouldn't be tempted, even if the profits are potentially large. You'd come unstuck sooner or later.