From a customer experience standpoint, I have had to pick a new supplier (energizect) the suppliers name shows up on the supply side of my eversource bill with their rate, and the start eversource rate there as a comparison). Nothing else changes.

I switch things up with suppliers regularly for the least expensive. It's only a matter of a few dollar usually.

The cheapest happened to be eversource (for me anyway) since the October meter reading. I just signed up with constellation (havent heard back from them yet), in the past Ive used several suppliers.

Its pretty seamless, you just need to watch the rates and change it up now and then.