I love the Pikkolo without the support belt for front carries, because of the lack of bulkiness. I'm not one who really enjoys the hip belt of an Ergo or something similar for a front carry, particularly if I'm going to be standing up and sitting down a lot.
However, the support belt makes the Pikkolo awesome for back carries -- the design is ingenious and I don't think it's any less comfy for me than an Ergo. The straps being snugly buckled against you are going to hold the hip belt against your body and cause the baby's weight to be effectively transferred to your hips.
Also, I really like the double adjuster shoulder straps as they're always able to be adjusted so you're pulling the straps towards the front, so that's a bonus over the Ergo or Beco (both of which I use and love, but they're not as easily adjustable for a back carry because of the tricep-curl maneuver you have to do to tighten the shoulder straps by pulling straight back towards baby.)
Finally, I love the memory foam in the shoulder straps. I think it's genius.