I LOVE THIS TOP! Buy it now you will not regret it! I am a 36/38C, about 165-170lbs, and 5'6" and ordered a 10. This top is my new favorite workout top. The built in bra is great for workouts that do not have a ton of jumping but I personally felt like you CAN do PIIT workouts with some jumping/high impact. I was worried about being self conscious with all the cut outs but I feel amazing in this top. There is more cleavage than what I am used to wearing at the gym so just be aware. I left the pads in and feel comfortable with that at the gym - it makes me feel more covered and is an extra layer in case I get cold. I took them out for workouts at home and that is great too.
This fabric is super soft and dries so fast - I only take this top if I workout on vacation because I can do a quick hand wash in the shower, hang it and its 100% dry by the next day. I have had it for a few months and literally as soon as I wash it I wear it again. I plan on wearing this just as a going out top in the summer too. I am totally going to buy more