Overall, ubidot is good for beginners. We can experience iot using ubidots. In my opinion, ubidots is not good for commercial iot product. But for development stage, we can use ubidots.

I used ubidots for develop some iot products. I interface WiFi module (esp module) with ubidots and created some data visualization projects. I like the interface and it's easy to connect between hardware with ubidot interface and we can easily visualize data like graph, plot, animated styles etc..

I faced some connectivity issue some times. And also, I see that, some data are missed. I mean, when we send data from hardware to ubidots in high speed, some data droped from ubidots.