I looked at your profile.As you're fairly new , I think there may be some easier ways for you to cut down on filing. I was thinking the same as you. I have chosen to work on my product application, and minimize the filing by applying the product more accuratly in the first place.
If I had clients that were going from art, to color, to P&W, to clear nails, I would invest in an e-file (and the training associated with using one correctly) But I just don't find the need for one at this point!
If I did, I think I would choose KUPA, just because of the videos on their website . Check it out you'll be there for hours!:lol: