I own the Superior SS-1 which is made by the same guy as the Assassin and I've never had issues with bridging or wood burning up and I cook around four times a week on it. As long as you let it come up to temp BEFORE you add the wood you should be okay with it not burning up. In relation to bridging if you use lump and watch the size you put in the chute you should be perfectly fine.
Keep in mind that adding charcoal and wood to the Humprhey's cooker is going to be more work than with a gravity fed; if you use water, clean up will also be a little more extensive. I quit cooking on my BWS Fatboy once I got the SS-1 because the product was no different and it was much less work for the result.
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