As a professional musician, albeit violinist, who also dabbles in woodwind, I was wandering through your thread and thought I'd add my thoughts for what they might be worth.
I personally know Paul Edmund-Davies (a name the majority of keen flautists will be familiar with), and he plays a Powell flute. Now I'm not suggesting for one minute that us lesser mortals have enough cash sloshing around to afford a Powell flute, but, for those who may be prepared to go the extra mile on their upgrade, Powell run a division called Sonare Winds and they produce a range of highly regarded upgrade/advanced flutes which uses the solid-silver, hand-cut, Powell Signature headjoint.
They are available with silver-plate tubes or solid silver tubes (depending on the model) and a choice of either a C or B footjoint.
I know that Paul has tried these flutes out for evaluation purposes and speaks highly of them. Ok, so some of you are probably saying - "how much did Powell pay him to say that?" They didn't, and he's not the sort of guy who'd stick his own reputation the line for some gimmick.
I tried one out for myself, alongside a TJ Masters 1 and an open-hole Yamaha with an Altus headjoint. I played them all blindfolded, so I had no idea which I was being handed. Before removing the blindfold I chose the one I preferred and it was the Sonare 5000. I swear it was because of the superior quality headjoint. The instrument honestly sounded as good as any you'd find amongst mid-priced professional flutes. The cost?? £945
But, as with any musical instrument, tonal likes and dislikes are all down to personal preference. As for reliability, this is often down to personal experience. The same can happen when buying a car - two people with the same model of vehicle, one has no problems while the other has nothing but trouble.
Finally, I have no idea how Sonare compare to Armstrong flutes, but I'll remove my sales hat now.....before Liz has me shot
Amanda