I don't know any partiuclar brand, but steer away from the ones that have thin straps, as they'll dig and pull in the one area. If you're going to go a carrier make sure it spreads the weight across the back and not just in the neck/shoulders.

I love my ring sling, it goes over my shoulder and down onto my arm and across the width of my back. The only problem I had was when I first got it and didn't put it down over my shoulder so I got an ouchy neck afterwards! I learnt quickly LOL! We also have an Infantino carrier which is fantastic, padded shoulders and spreads the weight really well, Shel carries Jazz in it at least an hour at a time and has no problems.