I popped this in the 'general' thread for all Mangrove Jacks yeasts, but given it concerns the M79, it's worth popping in here too.
I entered (as stated above) my mild into the TSHBC as a bitter. I expected to drop a few points, but more for laughs and keep the comp numbers up.
It got a bronze. So lag time isn't an issue. I rehydrated, but still got some lag, but not what has been typical of most.
I also made an RIS with the yeast leftover from the mild. I took a 600ml coke bottle from the bottom of the fermenter through the tap, let it settle in the fridge and then poured off the beer on top and chucked in the yeast, leaving the trub in the bottom of the bottle. It also had to work with the limitations of my system to get 2 x 15L lots of high grav beer* (see the two pot stovetop method thread). So everything that could have gone wrong was there.
It got a gold.
They're obviously decent yeasts, even with the 'lag' - if it bothers you, rehydrate. I did and it worked.
*Incidentally the 'other' beer on the day was a bronze and I was informed by the judges that if it had been entered in as an AIPA not an IIPA, it'd have been a gold as well.