I'll just come out and say that I used to work there. After about a month, I left to join a different group for xyz reasons.
I don't think DTP knows who I am, but I was in his training class. He's a good guy.
As far as people making money, I was one of them. Out of 1 month of trading nt, lu, q, ect...I only had 1 losing day: a -3 dollar losing day. I was netting 50 bucks using only 1000 shares by the last week of the training program, and all my days prior had a net of 30-50 using less size.
I saw people make money there with my own eyes...I remember this guy who started throwing around 10k orders after only 6 weeks, making 96 net per trade, a few times per day. (no losses)
If you already know how to trade, I think the commish structure there is fantastic. Its the lowest thing i've ever heard of. Compared to where I'm at now, its absurd.
If one day I became an independent/retail/arcade trader, I'd strongly consider going back to them, just because the commish is so absurdly low.
The one beef I had prior to leaving, and this wasn't the main reason, was the tech problems. Our platform would either freeze or go down a MINIMUM of twice a week. My last week there, it went down 8 times ( 3, 3,2,) in a few days.
Aside from that, I think its a fantastic way to learn about the importance of order routing/reading the tape/l2. Its funny because the place I'm at now, I just take the ask if I want to buy something and I could care less about where I get filled. But I've still taken some valuable lessons from HLV and I still use it to trade...like the lunchtime chop....some people say you can't trade it...well I don't think those people have ever sat at HLV for 30 days trading a stock that moves in a 1 cent range.
The "chop" on KLAC or GOOG isn't really that hard to trade after you've been trading LU.
Bottom line: my experience there was not bad. If you're one of those people that thinks everyone is out to get you, you won't fit in anywhere. Just accept the fact that the glass will never be 100 percent full or empty; just find the right fit.
hope this helps.