The integration of all my different point-of sale systems with one app that allows me full control over them from anywhere in real time has been great! It's also very easy to make changes or updates without having to call everyone up individually when they are off their shift at another store/POS system etc.
Sometimes it can be slow but I would say this mainly depends if there have recently been upgrades made by other POS companies as well which we should expect given how quickly technology moves forward nowadays!! There really isn't anything specific i dislike about merchantplay though - everything seems excellent so far! We've not had an issue since implementing MPP several years ago now (although some days things do take longer than others!) So happy users = Happy business owner :).