In reply to Flinticus:
I can't claim familiarity with this setup but i have done lots of caving SRT. Doing that, i have the base of my Croll (an ascender without a handle) attatched to my waistbelt, while the top end is attached to my chest strap via a tiddly maillion.
This all works fine so long is the Croll is held in position. From the picture you posted, it seems as though both the ascender and the micro-traxion are free to slop around as you move up. If that is indeed how you use it, i can't see that working well. They need to be fixed in position so that they cant pivot either upwards or downwards.
When i've done self belayed climbing, i've just used the caving setup. The only problem with this is that the tension in the rope upsets your natural balance.