The fact, that there is no need to install application of this provider separately from WhatsApp platform itself - it's great! I think more simple interface would be good too (however everything works perfectly fine).
It takes some time until you will get used with all features like QR-scanning or sending stickers etc., but once we're using them - they are just perfect! If only it could have been even better by adding one extra function so far : scanning barcodes directly in app as well :) However these two functions do not affect much our business at current stage. Just try us out if your customer needs such functionality while chatting via popular messenger apps (like Whatsapp).