Actually this for me is an issue, I use email search all the time, primarily for when I travel and have to look up various confirmations codes, reservations, etc. I also email myself all the time with notes, links, etc. The only issue I am having is that
1) Gmail works quite well for me right now
2) I don't want to pay $4 a month for this
3) Another company with access to my email
However, while the app is free I will definitely test it out especially appreciating Gabor's replies and comments here and elsewhere. If it's truly faster and also provides me effective offline access to the info I really need, well I would still have an issue paying $50 a year for it, but at least it would be a consideration.