I have owned the Remington i-light for a year and can say that it definitely works, but you definitely feel the zap at the higher power settings. It has enough joules to produce permanent hair reduction. The jury is still out on the Me elos. IPL joules is not enough + RF not enough so hard to tell whether IPL+RF really does add up to effective power for permanent hair reduction. The elos is pretty painless but will it be effective?
Until more clinical studies come out, the Remington i-light is the best bet!
The Remington is old technology IPL, the HoMedics one uses elos technology. The same guy invented both. He invented IPL in 1991 and the elos in 2001 to overcome the linitations of IPL, both technologies have only recently been used for in-home devices. The IPL patent has run out, so several companies have these types of machines (Philips, Boots etc). The elos patent is still valid and therefore only one device is using this more advanced technology. The Remington also has a really small treatment window and treatment times are far slower as it can not flash as fast. Lastly, the Remington can not claim permanent results, the Homedics me can.