I love that its so easy to use, you can send data in realtime or store it for later processing using their API's which makes things very flexible with our system as well! Very good pricing too compared other companies we looked at (eg AWS). The support was also great when they picked up my slack while working remotely due issues around connectivity from home wifi etc - really appreciated this!! There are some functions of course where there could be more features added but overall not much complaints here yet? We've been able solve all problems relating directly back into product development by being alerted about any changes/bugs early via email notifications rather than waiting till after launch like most systems require us do currently- saves alot if downtime during major releases :).