Most people seem to post they can notice the difference in stiffness of maxle over QR
Which is odd, because I pretty sure I can recall being derided for suggesting that one could discern flex, or lack of, between various stem, bar combos etc – gurning hypocritical c***s.
I paid quite a bit more, and wasn't terribly fussed…
It really depends where and how you ride. Flex is most noticeable when things get rough/choppy for extended periods. If you generally ride smoothly, or dont tackle long periods of rough fast tech terrain, then you probably wont notice any difference.
If you intend to tackle bigger trickier stuff then you may well notice the flex or appreciate the added stiffness a maxle provides, depending on your choice.
Also, bear in mind that an otherwise stiff component build will highlight a flexy fork, conversely a light or flexy componentry will make it harder to discern any difference.