In reply to Robert Durran:
It works fine, you just need a multidirectional piece such as a bomber cam or two opposing wires. I always extend the trax on a 60cm sling so it can't mess with the gear too much.
When doing this I take 2-3 microtraxions depending on planned pitch length and tend to climb on a triple rated skinny single with tagline and plenty of extenders, unless half ropes are absolutely necessary.
Last year in Sardinia we used this technique to climb Via dell'Amicizia (VII) (700m) in 5 hours and 6 overall pitches, cutting 2 hours off the guidebook minimum time. Our longest pitch was 150m.
It's worth noting that this technique works best when you are within your comfort zone and can safely tolerate bigger runouts and only place gear where you actually need it. We had plenty of margin on this route and so in some places really ran it out where the rock was solid. We used a rack of 15 quickdraws, 7 cams, set of wires, 3 microtraxions and the usual assortment of belay/slings etc, plus a 60m 8.7mm single. I took one fall low down whilst seconding due to a foothold crumbling and it was a very relaxed experience. A brief bounce on the rope which was springy enough to propel me straight back onto the rock and onto good holds again.
As a general note it's always nice to have 1-2 rope capture devices with you on big winding multipitches because if you link pitches and end up with loads of rope drag at the top, you can easily set up a z-rig with 1-2 microtrax and a guide plate which means you can safely and easily pull up slack and belay your partner(s) without knackering yourself in the process or leaving unknown amounts of slack in the system.
Post edited at 11:26