Yes we’ve had cricket for a number of years and had nothing but good things to say about it including in this forum.I'm going on 3yrs with Cricket. 4 lines of "unlimited" everything for $100/mo all in. Like you say, data gets throttled if you go over the threshold (I forget how many gigawitz), but I don't think any of us ever have gotten there.
Like said a few times above, I know with TracFone, depending on the specific phone you have with them, you may have been using Verizon towers for years. I believe it's the same with Cricket. Most of their phones use AT&T, some use Verizon service.
Some years ago we switched over to Redpocket ATT for no other reason then save a few more dollars (10), higher data speeds and maybe at the time more data was a nice bonus but nothing at all against ATT owned Cricket, in fact I would suggest it to people who might need a little more handholding, it was a good service for us.