Old thread, I know, but I'll chip in as another Big RR owner.
I bought it as a compromise - I'll hit Llandegla maybe once or twice a year with my son, but mostly I'll be on the roads, or perhaps around flat forest trails or converted railway lines with the rest of my brood.
I also fitted some narrow (32mm?) tyres to it earlier in the year and it "looked" absolutely fine - I used it for a Duathlon at Oulton Park, and it rolled fine! Got absolutely caned by the guys on the "proper" bikes, but managed to lap at least one of the other MTB riders that day!
I've added bar ends, stuck on my old grips and swapped the pedals for a pair of £12 Wellgo flats (in red
) , as well as having to add a bracket for the trailer bike that one of my kids is riding at the moment.
For me, its the perfect compromise bike - despite its rider, I'm sure it'll handle a few trips around the trail centres, on the road its fine (the lockout is a little "clunky" but can be set whilst riding which I like), it takes narrow road tyres fine (and there's quite a choice, being a 700c wheelset) and the riding position suits me. I can cruise along at a much faster pace on the road than I could on a 26inch bike (according to my son, who would invariably be following me!).
I'm not tall (5ft8) so got the smallest of the frames. I reckon for the money, if you are after a 29er you'll not find better value for money. I don't care about a few kg, on the way up that just helps to encourage me to be fitter, on the way down, it just helps gravity along a little bit!
I even quite like the colour scheme!