Crazy to buy a any harness unless you can actually try it out. The store I buy from, American Arborist in West Chester, PA has like a 7' welded "rig" with a doubled-rope loop, rope snap and friction hitch ready to go. They let you clip-in, hoist up and "hang out". Don't waste your money on something you can't return, they're not all as comfortable as they look. If you must buy one without trying it, I STRONGLY recommend the Skylotec Kolibri Hummingbird. It is also called the "multi-slide". (Leeloo Dallas multipass. SHE KNOWS it's a multipass...) It's incredibly comfortable and has a gazillion attachment options. I've been climbing in mine for about 8 years and I absolutely love it. Not a bad value either. I have a 30" waist and the medium fits fine.
Got my skylotec from American arborist when I first started. Picked that over the tree motion and honestly it was a mistake. The leg straps were a nightmare. Pinched me in the most uncomfortable of ways. I agree with trying it out first but you learn a lot from reviews online.