Product review (4 stars): So far, a good deal
They are somewhat bulky (thick) but the guts are doing work.  You can't use two of these in a standard duplex outlet.  We've had a lighting strike close enough that a power strip (elsewhere) blew out.  Appliances on these devices are so far unaffected.  Devices are still functional too. For the price, seems worth the insurance.  Purchased in May, 2017.