In reply to The sharp end:
I had mine done last February, so I'm in month 8 of recovery. I had an allograft (achilles tendon from a cadavar). I also had badly sprained lateral collateral ligaments and torn mensicus that had to be partially dissected.
I'm getting better continually, but at nothing like the rate of the other posters. This may be partially because of the other damage, especially the mensicus, but also because, at 68, I'm probably quite a bit older than the others. Discussion with my doc and extensive research on the internet suggested a year's recovery; 8-12 months is is a pretty common figure for professional athletes, who are typically less than half my age, have state-of-the-art rehab facilities, and have nothing else to do except work on rehab, whereas I am still working full-time. Their demands are ultimately more intense than mine, but I figure the other factors even out the recovery time.
I've done rehab exercises pretty continually. I wore knee braces for the first month or two. Allografts are more vulnerable early in the healing process than autografts and that accounts for the conservative use of the braces. I use poles for all my hiking, and still have some pain and weakness when I have to step down more than a foot or so. I can't really run yet; pain builds up in the knee pretty rapidly when I try. Walking and hiking are fine; it is the increased impacts of running I'm having trouble tolerating. I'm pretty sure this more related to the removed meniscus than the ACL repair, however.
As for range of motion, my leg straightens completely, but I can't quite sit on my heel yet; stretching this out has been a very long and slow process and it seems likely that I'll need several more months of it.
Climbing hasn't been too seriously affected, after factoring in the deconditioning effects of more than half a year away from the rocks. I'm currently leading 5.8's in the Gunks, which roughly translates to HVS I think. I wasn't managing to lead much better than mid 5.10 (trad) before the injury, and that level seems possible to attain again and at this point requires mostly conditioning of other body parts, not the knee.