Honestly? I'm not impressed.
One, I would never wait passively to be attacked - I realize that this is their training scenario, but if that's the case, then the attacker needs to force the defender to the ground as a start - because there's a significant difference between being attacked on the ground in a position you get into yourself and being attacked on the ground after you've been thrown there.
Two, once the defender begins countering, the attacker is largely passive - just holding on. This is not, IMO, realistic. If someone is really attacking you, and you start kicking and punching, it's not likely the attacker is just going to lay there and hold on.
Three, I found the weapons scenarios, especially the gun, to be unrealistic. The theory is sound, sure - but unless you train like that all the time, it's just not going to work; you're gonna get shot. If I were protecting another person - especially a child - then yes, I'd try it - but I would have to be desparate before I grab a gun pointed at my forehead.
Four, in the multi-attacker scenarios, the still attacked one at a time, which isn't going to happen. Multiple attackers are going to attack simultaneously, and anyone who thinks - and trains - otherwise is in for a nasty surprise.
Five, the kicks were pretty and well-placed... but even with the padding, they didn't appear to be using much power. The only reason for that much padding is so you can safely pound on the attacker, and they weren't doing it.
Six, the two who spoke at the end may, indeed, feel confident - and that is the most dangerous thing of all, IMO. Confidence is all well and good, but given the issues I saw in the video, it is false confidence - yes, they learned some skills, but they should not be nearly as confident as they seem to be - a truly resisting opponent (rather than one who just hangs on when the counter-attacks begin) is going to come as quite a surprise, and those pretty kicks they were doing aren't going to work.
Model mugging and its offshoots are a pet peeve of mine - because they provide a self-confidence not backed up by the repetition found in regular training; like CPR, the training needs to be repeated at regular intervals, and too many people don't do that; they take the class once and figure they're good for life... until it's too late.