No need to apologize, you didn’t waste my time at all! I am happy I was able to help, and I think more people should be aware of how headphone companies sometimes fudge their numbers, so you gave me a great opportunity to talk about that a little bit. :)
I can completely sympathize with being in a loud apartment, because I also live in one. Two of my neighbors have loud dogs, and until recently the guy upstairs from me would constantly wander around outside late at night talking on his cell phone, haha.
The 380 Pro is a quality headphone and I know many people swear by them, but I actually had a problem where they wouldn’t seal quite right on my head and I lost all isolation and bass response! So I didn’t end up writing a full review. (I was using their gaming headset version).
I’m testing another Sennheiser headset that has solid isolation right now, the GSP 300, and I should have a review up in the next few days. It usually goes for around $100 and it’s been on sale occasionally. For Black Friday/Cyber Monday at the moment, I’ve seen it around $78.
I don’t have my review finished yet, but this one and this one are good views that finally pushed me to check it out. It might be worth looking into if you’re a gamer! It’s a little clampy, but I’d put its isolation about on par with the XPT100. They are also driven with authority out of just my MacBook, so you shouldn’t need an amp.
A lot of audiophiles/headphone fans/reviewers out there love open backed headphones, but I almost never use them because I do most of my work in a loud apartment or a loud coffee shop, haha. So I was all too happy to take a moment to talk about isolation!
Thanks again for reading and for the questions. Happy headphone hunting! The best advice I can give is to buy from a place with a good return policy, on the off chance that you hate something or it doesn’t suit your tastes. I personally buy all the stuff I review, so I’m just a regular consumer in that sense. The only way to “know” is to actually try them out!