Just about any gear of this sort will last quite a while. Eventually, caps will start to go, sooner if less expensive parts are used. But caps are easy to replace and all amps need to have it done at some point, albeit it's going to happen years later in a Bryston.
Critical precision resistors can also drift, but this is true in any equipment. They too can be replaced.
All of which is to say that I wouldn't worry about longevity. I wouldn't worry about resale price, either, if they're good now, they will be good in the future, and so they'll retain reasonable value. And they're popular enough that they won't be an orphan brand that nobody has ever heard of and potential buyers don't recognize.
To me, the real question is whether you want to spend significantly more for a relatively small increase in sound quality. I don't think there's any way to answer that short of listening yourself. But I can say that the reaction to their sound quality has generally been enthusiastic. Typical would be these are amazingly good for the money, though not quite the equal of (insert super-expensive amp here). It's my personal assessment as well. Another way to put it is that if you're familiar with the sound of large, modern class AB bipolar amps of conventional design, that's pretty much it. But the big amp grain is very light and I actually find it a sweet amp, with just that very minor grain to separate them from amps that have mostly lower-order harmonic distortion.
Because they have a money-back guarantee, if you decide to return them, you'll be out only shipping cost (for a very heavy package) and the work of unpacking and packing them (these things are heavy!).
Critical precision resistors can also drift, but this is true in any equipment. They too can be replaced.
All of which is to say that I wouldn't worry about longevity. I wouldn't worry about resale price, either, if they're good now, they will be good in the future, and so they'll retain reasonable value. And they're popular enough that they won't be an orphan brand that nobody has ever heard of and potential buyers don't recognize.
To me, the real question is whether you want to spend significantly more for a relatively small increase in sound quality. I don't think there's any way to answer that short of listening yourself. But I can say that the reaction to their sound quality has generally been enthusiastic. Typical would be these are amazingly good for the money, though not quite the equal of (insert super-expensive amp here). It's my personal assessment as well. Another way to put it is that if you're familiar with the sound of large, modern class AB bipolar amps of conventional design, that's pretty much it. But the big amp grain is very light and I actually find it a sweet amp, with just that very minor grain to separate them from amps that have mostly lower-order harmonic distortion.
Because they have a money-back guarantee, if you decide to return them, you'll be out only shipping cost (for a very heavy package) and the work of unpacking and packing them (these things are heavy!).