Every shop has good and bad points, you have to pick the right ones for the right job.
I may go to 4wd Upgrades to get them to fab stuff up and fit something (say an engine)

or get some parts fabricated and fitted

but I would trailer it to a auto sparky to be finished if it is not an off the shelf product with an off the shelf loom (this from multiple people's expierience)

. 4wd Maintanance I would not go here either (again many others expierience)

, they are good guy's and the Marks adaptors were the problem in one case at 4wd upgrades (they ended up having to get the faces re trued to fit it) but they specialize in Upgrades and are not auto sparky's.
They have cleaned up their act and seem to be better at a lot of stuff but they do not know when to say we outsource this to these guy's. this is their
current trouble with reputation.
I will go back to 4WD Accessories to get some things done Rick knows a lot of people and a lot of what has been done before, what works and gives good accurate advice for free. His company also covers all maintanance WOF's and parts you need for most applications.
Summit I have also recommended but they are specialised in Landrover products and the problem was with a landrover, this was also resolved in a couple of visits the second being Labour free as the first didn't fix it, noone could complain with that.
As far as slagging anyone off goes I do not think anyone has done this each and every company has limitations, knowing them and working within their limitations is something they should do, and if you know them you should be able to as well.
Just saying XYZ sucks is far worse than saying they did XY perfectly but I would never get them to do Z.
Just my .07c with Sweedish rounding
P.S. Mike keep up the good work with the site, you are doing it well and are independant! (I need to see your avitar more often

)