This type story is why I check all my used/new purchases out via many, many test shots, sometimes several hundred, shots of all type/many situations, and fully review the results prior to deciding to keep. I do this even with old gear, it is very well worth the effort. My other question would be did you buy the "dock" (Tamron Tap-in console) and utilize it in the ordeal?

Oh and the Reagan thing:

The phrase "Trust, but verify" was Reagan paraphrasing a Russian Proverb. This came out of his wanting to know not what the Kremlin thought, but what the Russian people thought; From 1984 to 1988 Reagan met privately with Russian Historian Suzanne Massie to learn what he could about how they might respond to ending the cold war.

Massie’s conversations with Reagan are the subject of her latest book, Trust, but Verify: Reagan, Russia, and Me.

“Reagan was the only politician I ever met who really wanted to know not, ‘What did the Kremlin think?’ but, 'What did the Russians think?'” said Massie.

One of the first things she spoke to the president about was the importance of the Russian Orthodox Church. In Massie’s description of that first meeting with Reagan, speaking about the Russian religious point of view was an ‘aha’ moment for the president.

Gather ye, my friends & fellow hoggers close to your computer monitors so that you might be warmed and made wiser by the words I will write here.
A few months ago I suffered a serious GAS attack and was moved to purchase a Tamron 150-600mm G2 lens. After much research I found the lens of my dreams at MPB Photography in New York; a revered and well established firm. The lens arrived, my heart swelled with pride, strangers marveled and said things like, "what the hell is that?"
Yet, not all was well. My photos were close but "no cigar". Images I thought were outstanding, weren't quite sharp. Occasionally I would get a photo I could love but it was hit or miss. "A steep learning curve," I told myself. "You are still learning how best to use this thing," I said. Time passed.
Finally two things happened. First, I realized I was past MPB's 6 months warranty and second, I sent the lens to Tamron for repair & service. They found 5 problems with the lens. I was and am highly p---ed at myself for letting the warranty expire, at MPB's quality control failure & at Tamron for their quality control failure & because the warranty is not transferable.

My Scottish ancestors scream in my head, "have ye learned nothing in your eighty plus years ye daft fool?" So I leave you with these words of wisdom from a man wiser than myself. "Trust, but verify," Ronald Reagan.