most of the features in op3 look better than in op2 at the first glance. However, they aren’t customizable at all. At the end, you end up using mostly custom html to get features that were once possible in op2. Also op3 can’t calculate taxes anywhere exept europe and doesn’t have a built in optin to paypal.
If you use op3 as a business and not just write an article about it without really having use it, it’s really frustrating. Can’t recommend. Don’t make the same mistake as I did.