What the heck, one more anecdotal input:
I run a single 34mm Mikuni VM round slide and am very happy with it.
I built my Commando from a rolling basket and a pile of spare parts. The Amals were a wreck.
Instead of spending time and money fettling the Amals (which I seriously considered), I opted for a quick solution and bought the entire single Mikuni kit from M.A.P. The kit came with everything I needed with a beautiful manifold, pre-set carb and cable. I bolted it on and it ran great out of the box. The bike has always started first kick (OK, occasionally second), idles reliably and provides smooth power delivery throughout the RPM range that I use on the street. I can't comment on the comparison to the Amals as the only time I had with them was when they were slap worn out and running horribly. I've actually thought about re-sleeving them and replacing all of the jets just to compare but the Mikuni is running so well I have no incentive to spend the money.