Experience with Grow Surf and Impact Advocate for Referrals

Anyone using either Grow Surf or Impact Advocate (formerly SaaSquatch) for a customer referral platform? Would love to hear your experience. And can you share your reward system/payouts for a multi-stage referral such as 1) xx for referring a friend, 2) xx when the friend completes a demo/discovery call with your sales team, 3) xx when the prospect signs on for a contract of at least xxx in ARR. PM me if it's too much to share in this open forum. Thanks in advance! 🙂