BFMR has been excellent. However, occasionally Walmart uses Lasership to ship my items to BFMR in New Hampshire, and Lasership is the worst.

Lasership tracking info usually contains misinformation. Packages containing ipads or laptops were ' Left in lobby', or 'Left at front door', 'Left at Person'. Sometimes it would randomly say 'package secured in our facility awaiting further information'.
And sometimes the delivery guy would forge my signature.

One of my apple watch showed as delivered by Lasership but never got checked in by BFMR, after four days I pinged BFMR, they investigated for four days and still couldn't find it. So I ended up asking Walmart for a refund, and luckily Walmart was kind enough to give me the refund.

The lesson learnt is, don't buy too much, there's always an inherent risk that the retailer would refuse refunds and a $500 loss could take $50000 of MS to get back.