First, the WYSIWIG editor still lacks some very basic features, such as an undo button. SnapApp seems preoccupied with developing new animations and other user-experience tools, which is great, but it remains extremely frustrating to create each SnapApp.
Furthermore, there is little to no mobile integration-- "mobile responsiveness" on each SnapApp means creating a separate SnapApp, basically, for each mobile view.
Third, there is poor UX in general when it comes to finding out how to do things-- I don't want to pick up the phone every time I don't understand how a feature works. Design, of course, really depends on your design team's work; SnapApp, predictably, has rolled out the best SnapApps I've seen, but there are also plenty of other SnapApp customers who are probably more in line with what you can expect if you are a one-person SnapApp creator.
Finally, SnapApps are disabled upon end of subscription, which I suppose makes sense from the business standpoint, but precludes my desire to rely on SnapApp for anything that users will see for the long-term.
Keep in mind your ability to create and design SnapApps efficiently. The product is an interesting one, but you may be better served by using SnapApp subscription money on something slicker (and that won't expire).
SnapApp has certainly succeeded in making each marketing campaign more interesting and more interactive, which has been good for our brand for the most part. However, we've achieved similar to better results with in-house designed material. SnapApp is quite frankly neither instrumental nor interesting enough to warrant a continued subscription.