Some don’t care for the Sennheiser sound.
What exactly is that "sound"? I've owned three different sets of Senn headphones - HD800, HD6XX and HD600. The HD800 sound completely different from the HD6XX. I didn't care for the HD600 and sold those. The HD800 and HD6XX are night and day different. I like them both, but they don't share a "sound".
I've heard good things about the HD58X Jubilee, but haven't had a chance to hear them. The HD6XX is basically the HD650, which used to sell for around $500 before Massdrop introduced the HD6XX.
The downside about the Drop headphones is that you can't go audition them unless you have a friend that has some.
Sound signature is important, and the HD6XX have a warm sound that some might find a little "rolled off". For their size and price, they do well in the bass department, have really nice mids, and present plenty of detail in the highs, but are not bright or fatiguing, which is why I choose them more often than not when grabbing something from my headphone collection. For me, comfort is also very important and the HD6XX are the most comfortable headphones I own.
I also like HIFIMAN, Audeze, Focal, and AKG (the Massdrop x AKG K7XX are another good option in that price range if they still sell them).
There are a lot of options and I doubt any in that price range would leave you really disappointed. You can only get so much from reviews and other people's opinions, you need to try different ones out for yourself. We all have different tastes and there are a lot of flavors to sample.
