QCTM on both of these threads. From everything I can gather, the product works fine. It's up to the buyer to decided whether to purchase.
On another bike forum, the is someone who sells protectors for spin-on filters. They also sell a tamper-resistant oil filler plug. Innovation and choice in products are good things.
There are lots of areas where the CX/GL's can use improvement, so the tinkerer/farkler can stay busy to his heart's content.