Documentation is amazing, dashboard is amazing, pricing is high, you have to have a lot of volume before they will consider lower rates and/or removing/lowering the flat per-transaction fee. I'm also migrating away. Another reason I'm leaving is in-person payments. They have moved forward on that front but their offering is still pretty lacking. Lastly other processors will profit-share with you much earlier, stripe will do it but again, you have to have a lot of volume first.