I do have one, hardly used it, but when I have it gave a much clearer picture of capacitor condition that my multimeter (I have a Brymen 857s multimeter).
IE multimeters can give incorrect cap value, and when you see the 5000 show low cap value and also show the esr value of cap is out of spec you know to change that cap.
They are really well made, Dave has covered it well, and if you search the forum you'll see that many members got one and are happy with the performance.
Oh and I am a big fan of the Brymen meters, Lightages advice here is very good.