Our letter wasn't like that, it was more "they're sooooo efficient" blah blah blah!
We have dual fuel here and though I'm loyal (mostly) I do shop about and managed to dodge the smart meters for several years! Until we joined Eon, the deal was too good to IGNORE. We've not had any issues with both meters. The gas meter is in the same place as the original, tight spot under the stairs.
Must have a good built in Wi-Fi as my router Wi-Fi actually loses connection and that sits 2 foot in front of it! I can sit with my tablet, right next to it, "no signal."
We swapped from Eon after a year, spent 2 years with Ovo, (they refused to redo a deal as prices rising..... This was 2019) went with Edf for a year then got a phone call off Ovo asking me if I would like to lock into a 2 yr deal £90 a month starting from November 2020! Jumped at it.
Ukraine war ........ Now, still with Ovo and £270 a month variable (always had fixed! Usually around £110 a month).
Actually, in the late 1990's our dual fuel was £70 a month, I miss them days!
I now log on to Ovo to see energy use each day! Used the MF stove to cook dinner on Sunday, didn't make any difference. Must be the 2 uprights, 2 chest freezers and fridge freezer full to the brim of beef, pork, lamb and chicken costing us!