Refilling disposable camping gas canisters with Propane - Cheaply

Refilling disposable camping gas canisters with BBQ gas - Is this a good idea or not? Does disposable mean disposable ie Don't refill them??
I bought this refilling gadget of eBay from China, cost around $10 that allows you to refill a camping gas canister with straight propane from your BBQ gas bottle. Not sure why the BIX ceramic burner's flame was jumping up a little bit every now and again as you can see?
I'll try it tomorrow and see if after some time has passed that stops happening.
If you have any thoughts/suggestions after watching the video, I'd be happy to read them.....thanks!
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