Lets break this down one by one
1. does a specific piece of gear make a difference? – a particular piece MAY make a difference
there is likely a reason why wicking layers, softshells, windshells, light weight gear are more popular among those sponsored high output athletes …
of course you will note that
– every athelete who does similar stuff (example alpinists) often use somewhat different gear systems, yet they all perform at a very high level
– with a few exceptions, BPL is not the providence of top athletes at their limit
an example is the much touted "innovations" like grid fleeces and "active" puffies with fleece inserts … popularized by patagucci and dead bird respectively … for many years competitors such as THF, marmot, OR, mammut, etc … didnt have such "must have" items, but their sponsored athletes didnt perform any less well
now im not saying theres not a minor incremental benefit to new technology or pieces of gear … but the effect is VERY minor compared to a persons experience, fitness and skill level … especially if you arent pushing the limits
2. does a specific "performance" brand matter? – other than a very few exceptions the answer is a resounding NO … any "decent" brand will tend to work as well as any other …
look at sponsored athletes … they switch brands all the time, but dont climb/run/swin/bike any less well because of it
what a brand DOES matter is how it deals with warranty issues and its customer service
now some brands do have better PERCEIVED quality … a prime example is westcomb which is made in vancouver canada, has 20 SPI so they claim, and excellent quality control … as much as im a fan of that company, and i do own their gear, realistically it doesnt allow me to climb any harder, and i dont think the gear will significantly outlast my cheaper MEC items
3. does a "recognized" brand matter over some department store one? – it DEPENDS …
for something such as rain jackets i would say YES … as the better fabric does make a bit of difference, as does proper seam taping, etc … also the exceptional warranty on certain brands (OR, MEC, EB) is more likely to be used when the jacket delaminates eventually (weve seen this alot on BPL)
for other stuff such as fleece … not really … ive probably got 10+ fleeces. some old, some new, some dead bird and patagucci, some MEC, some no name … and honestly the difference has more to do with the specific design than the brand … normal dead bird fleece isnt that different from a cheap brand … MEC T2 (old style) isnt any real different from the cap4 (old style) … etc …
some department store brands are VERY GOOD … notably MEC … some have reported good experiences with lands end, ll bean, REI, target champion brand, costco 800 fill jackets, etc …
4. but i can buy a "top end" brand for 50%+ off – absolutely true … but remember that sales arent exclusively limited to patagucci or dead birds (and ive been enough to those factory clearances) …
proof in point … the BPL group buy for NEW MEC T2 hoodies for 25$ … you would be hard pressed to fond the cap4 hoody for that price anywhere …
after xmas you will see tons of these 50$ down jackets, 40$ windshells go for 10-30$ or so … i bought an old navy synth puffy that i wear every day and im surprised hasnt went flat in the last 1-2 years for 19$, it was 80$ new
heres a pair of climbing/hiking pants i picked up a bit back … it weights 310g v 290g for my dead bird palisades (which are excellent pants) … is just a breathable seems to be built well enough … it cost me ~20$ on clearance vs ~50$ for the dead bird which i got at a deep sale … well see how long it lasts

5. but this brand is very innovative – remember that alot of "innovation" is simply marketing run amok, the outdoor industry is littered with failed concepts
also remember that every company CLAIMS they are "innovative" (all companies, not just outdoor ones) as a reason why they are "better" … the reality is that there is very little real FUNCTIONAL innovation that happens successfully … its more often the propaganda of the marketing department
now assuming that this brand does come up with some REAL innovation that works … how long do you think itll take for everyone else to come out with their own version that works basically as well for FUNCTIONAL purposes ???
everyone and their dog now makes down sweaters, synth micro/nano poofays, grid fleeces … now not to say there arent slight differences that MAY make a difference to a particular user … but the best sponsored athletes in the world do the gnarliest things in those copies …
rab xenon, patagucci nanopuff, dead bird atom … it doesnt matter, give em the gear and theyll go climb/run/bike/etc … it
at the end of the day the differences in gear is pretty minor compared to other more important stuff …
;)