Well, after a long-ish delay having ordered just after it went out of stock, my Bulldog Brewer has arrived. I've used it to do my final extract brew (a double Galaxy pale ale) and will be doing simple oatmeal stouts and saisons for my first couple of AG brews as they seem reasonably simple.
Pros (so far):The unit seems really well made and the controller is very simple to use. It took far less time to get the wort to the boil than using the stovetop, even using the very big wok burner in my hob. It was easy to clean afterwards, and it seems that an AG batch should be very straightforward.
Cons (so far): Very few, to be honest. Really the only issue has been a distinct lack of good quality instructions. There ARE instructions but they are very, very brief and appeared to be for an earlier version of the unit with no explanation for how some of the apparently upgraded parts worked (the upgrades are piping from the case of the grain basket over which a sparge plate sits, much like the Grainfather) . That said though I emailed Hambleton Bard and they responded quickly confirming what I thought each upgraded part did, so I can't gripe too much about that.
If people are interested I'll give a more detailed description of my first full brewday...