It has the same sensor as the x-e2, but a slower processor, so it can be a bit laggy. There is a firmware update available for it which improves things a bit. It really depends on what you're shooting.
There are a number if good deals on the x-e1 at the moment and in some cases its almost worth buying them just for the bundled lens.
I use mine for all my holiday/travel pics. as it's so light and easy to transport. IQ is first class. I wouldn't want to use it instead of my SLR for model/wildlife or motor-racing photography though, (horses for courses). If you want a second camera to use instead of your SLR to carry about generally, take on holiday, that kind of thing, it's user friendly, no vices, I haven't noticed any focussing issues personally, (it's had the latest firmware update).
I bought one second hand recently with the pancake lens just as a carry around (fits in a pocket if its a largish pocket) Still getting to know it but for the money I paid for I'm very impressed. Very clean even at highish ISO, good metering, don't think the speed is much of a problem as your not going to use it for anything where your going to be gunning.
If your getting a good deal I'd say go for it, but think about adding the pancake lens to make it more portable, its not the most compact of compacts.