The problem with the Mac and others mentioned is that they are considered throw away and may be good enough for an add on but nobody would commit to saying how good they are or how long they will last because we all try and avoid them.
I don't think people are being stand offish on this one, I know Lee Kenny, Lee @ Blastaway, Matt, Dave, Rhinoman, me, Jaespray and others all have half decent machines and the ones mentioned wouldn't eve be considered
Good luck with whatever you choose - I would still go on a second hand diesel one!!
Rob