OK it’s been a few weeks now and I must say I’m still happy with my switch to Helium Mobile in the SF Bay Area (on the T-Mobile network).
Especially happy going from $90 (unlimited) to $16.84/mo for 10GB after taxes and fees.
T-Mobile did still bill me a for a full $90 month after I cancelled though (no prorate) because they suck, so be aware of that if you switch.
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If you want to give it a try, use my referral code I9TK1W8: https://heliummobile.onelink.me/o6WA/7prb01h4