I've been training at Omni for just about a month now and have had a great experience. When you enter the school, you'll notice that the atmosphere is a nice balance between focused and friendly. The training/conditioning is physically demanding, but the dynamic of the group reminds you that having fun is an important part of your training as well. There's no pretense here and all students (men, women and kids) can feel comfortable.
I'm completely new to Brazilian Jiu Jitsu, but Sensei Julio and the other students have been patient, knowledgeable and incredibly helpful in getting me into to the sport. The class sizes are fairly small (10-15), which allows for a lot of personalized attention (another school I tried in Manhattan had classes of 40). This has allowed me to hang around after class to ask my own specific questions, which has helped a lot.
Amongst the group of student there are many who cross-train through the schools various forms, which is a testament to the quality of the classes Sensei Julio instructs. Adult classes include Brazilian Jiu Jitsu, Judo, Kickboxing, MMA, and self-defense which are available to any member.
One important thing to note is that the school does not impose yearly contracts on their students. They help you pick a package of classes that best fits your needs/schedule without forcing you into a 12-month commitment like many gyms. This works out well because you won't be charged for weeks you cannot train which happens to all of us from time to time.
If you're interested in self-defense and/or getting a great workout (and if you're tired of the same gym routine like I was), I really recommend that you come watch a class and see what you're missing.