I've had my 4xl (clearly white) since Thursday morning and used the esr mimic case until yesterday.
It's really quite nice. It's slim, the glass back looks and feels great, and the tpu bumper feels grippy too.
Definitely a good choice and I was able to pick it up for under $15.
I also picked up the esr essential zero on sale (approx.$7) so I'm keeping that too. I'll probably try that one tomorrow as last night I put on the Google fabric case (bluish) and I'm enjoying it, as usual. I've had one for both my 2xl and 3xl and this one doesn't disappoint. It's a little bulkier than the esr cases, but feels good and looks good.
I'm waiting on the Rhinoshield bumper case to come out now. They always come out a month or two after the pixel debut, which is a little annoying, but I loved it on my 6P and 2xl and was sorry I didn't get it for my 3xl. It gives great protection from drops and still allows you to enjoy the look of a naked phone.
BTW the phone is great and battery life is fine.
Edit: just threw on the esr essential zero and while it seems pretty nice and fits well, I decided there was no sense in keeping it when I definitely like the mimic better and would choose that over the zero every time. So, even though it was very cheap, I'm returning it to amazon so I'll have the mimic, the fabric case and I'll wait for rhinoshield. Also, have been enjoying my 4xl naked at home. It's a great feeling phone!