Thanks for all the input guys.
After 32 hours (lol) it's time to take the plunge!
To be honest, I was expecting a trainwreck, but I was semi-pleasantly surprised!
When I cut open the bag, I was half expecting a rather putrid smell, but instead I was greeted with a nice (albeit "not what you're really aiming for") smell of beef stew! lol
Upon inspection, it doesn't appear to be "that" mullered - it certainly wasn't falling apart (which was most likely due to the temperature being 55C). Although it does have a slight 'braised' vibe going on!
*drum roll*
So I seared it for literally 20 seconds each side in a hot pan and prepared to sink my teeth in!
As you can see, it's pretty dry and overcooked (duh!) but to be honest, it was still very tender, tasted really nice and was actually edible!
I'll certainly stick to 90mins > 8 hours(?) next time! In fact, I might get another steak tomorrow and give it another go