My new Bio 500 Tour arrived today. Initial observations: It's 5 grams under specs, balance seems to be 3 pts HL as advertised. Dry swings feels good, not too light nor too heavy. Estimated SW is 310-315. Head shape is different from Bio 400T, more narrow and longer. Pattern is very open, much more then 400T, similar to Tec Tfight. It's factory prestrung with dunlop silk at high tension (about 60 lbs) Grip size is 2, and with overgrip it's perfect for me. I had to rewrap grip on my Bio 400T (G3) very tightly to get similar result. More to come tommorrow after my double session.