Imo only a GT,XT or H6 would be able to spin the rears in the same situation, so a similar test should be done with a higher output Subaru with the locker installed for people with those engines.
It was breif but at the end of one of powerofyourbrains's youtube videos they have the locker in a wrx and it definately kicked the rear out.
My 225/70r15 tyres are HT's less then a year old. MT's have far lower grip in the wet compared to HT's so I reckon I could spin them quite easily in the wet. And an EJ253 is much closer in torque and power to a GT then it is to an EJ22. An extra 35-40 HP is noticeable. Just the difference between EJ251 and EJ253 is noticeable. I also have lower 4.44 diffs that help.
(Forward to below paragraphs:See my earlier post where I quote [MENTION=3214]Subaru[/MENTION] Off-road's comment on powerofyourbrains's youtube video if unsure what i mean by 'squared off middle parts' and why I mention them)
Also, fwiw on the subject of kick out. i thought about it last night, and counting the number of teeth the ratchet has, and assuming the difference in width of the squared off middle parts of the locker is roughly 1 tooth wide (though it looks like less than that), that would mean that after breaking traction the inner rear wheel would travel at most 1/20th and at least 1/40th of a rotation before it catches up and transfers torque to the outside wheel. What exactly that means for added force I'm not sure but i can't imagine it would be much more than the torque that was being put to the inner wheel pre-breaking free, especially considering that after noticing slip your guna let off the gas. This is of course assuming that the difference in rotational speeds of the two wheels is small enough that it's overcome almost instantly once the inner wheel spins free.
There is probably a trade off. since while turning the car is trying to push its self outward with an open/lsd diff the outer wheel is going to have more downward force on it and is probably going to be a bit harder to lose traction on, however if it is lost the inner is already less forcefully on the ground and less capable of absorbing the sudden added demands on it. With torq-locker the inner wheel is going to have less downward force and may be easier to break free but after doing so the extra downward force on the outer wheel will likely make it better able to absorb the new demands.
So i think kick out will depend on wheather the outer wheel is on a more grippy portion of road or not. if all you did was hit a slick spot then it's probably just going to take over until the inner regains traction, and if it's on an equally slippery bit of road then i think it likely that all of the rear-of-car forces being suddenly transfered to it wouldn't be any different than an open/lsd diff suddenly giving them to the inner wheel. Added torque or no the latteral force from the turn it's self would more than likely be enough to get it to slide a bit on you.
After realising that, my fears of way too much added squirly-ness were eased. i suppose i may be wrong but i think 1wd foz is rite; unless your going hard enough that you'd already be halfway expecting it before locker install, or driving on a known unstable surface, these things are likely going to be fine.