What do you like best?
For me, the thing I like best is making use of the email address finder and the blacklist. Normally that's where our issues arise, and SendGrid makes it really easy to hunt down the messages and the email addresses I need to ensure proper delivery.
What do you dislike?
I have no substantive issues with SendGrid at all. I could stand a bit less in terms of the number of options on the side, but that is probably because my use case is rather more limited.
Recommendations to others considering the product:
Take some time to play around with the options just so you know how they flow. Initially it's a bit overwhelming, as there are just so many buttons, but you find what you need and it gets to be a simple process and you can do what you need in a heartbeat.
What problems are you solving with the product? What benefits have you realized?
Normally, I'm trying to see if someone did actually get an email and it's just in their spam folder, or if there's an issue within our own network that's causing a no-send issue. Other times I've had to go in to unblock an email address.