Got my Digitech pro monitors from Jaycar over a week ago. Took about 10 days from Australia to east coast USA. Not bad. Physically a nice product for $50 - good finish, a bit snug but comfortable. Have burned them in for some 60 hours or so with improvement obvious.
My regular phones are Beyer DT250-250, and I just don't see these Jaycar units ever matching let alone exceeding them, not with 5 times the burn-in and whatever any tweaks can provide. I listen mostly to classical, jazz, and world music, and maybe that's part of the issue - that the Jaycars are just not the bomb for these genres. Maybe if I were younger and less concerned with preserving my hearing they might be great for blasting metal, rock, or electronica. Maybe.
If I EQ them significantly, mainly carving out a 6dB U-shaped curve centered on 1K, they begin to approach the neutrality of the Beyers, but there are other failings. There's an unnatural glare through the mids on higher-level signal that's pretty unpleasant. The bass also fails the comparison; less control. I love the Beyer bass, it's present but never excessive.
More importantly they fall a long way short of the relaxed, musical naturalness of the Beyers that make it possible to listen for hour after hour. This coupled with the excellent comfort of the Beyer velour pads and perfect pressure, with light weight. The Jaycars are more isolating, and they do give an impression of depth and separation that's sometimes nice and other times weird.
I WANT to like them, and will continue to let them burn in, hoping against hope that they'll still improve, but they're got too far to go, I fear.