Ah, ok. Yeah, there are no perfect boats, even driftboats. I've owned a couple, and rowed a ton of them. They all have their drawbacks. If you're flyfishing only, glass is nice way to go. They do hold up, even against rocks if you pick a reputable maker. Would love for you to email me the link. Would be interesting to check out if it's made of that composite plastic they use for kayaks.
I've found that glass is quieter and floats you a bit higher, better for summer conditions, but don't pull plugs as well as aluminum (if you fish other then fly only). Aluminum runs slower, but is colder and louder. But can take more abuse IF it has quality welds. Wood is nice all the way around, but more upkeep on them. So the choices are endless. Just depends on what/when/where/and how you plan to fish.