Yes, though they make occasional errors, I think the holding midfield position and the wing is where we are mostly weak. (justarsenal.com)
Regarding your last question, I know of no editor who gives a money - back guarantee for occasional errors that happen to slip through or for a different opinion by a later editor. (thewritelife.com)
The only caveat is that there are the very occasional errors in MPAC or Land Registry (GeoWarehouse) so the info may have a slight chance of being incorrect. (remonline.com)