Visited May 24 at noon, flew out on AC1. Pardon the low quality mobile phone images.

I haven't flown AC in many years as I've thrown all my transpacific business to CX and BR (way better in all regards IMO) however was intrigued by AC's new premium push (plus amazing P fare ) to try it out again.

Signature Suite is a nice looking lounge (hate the name), rather dark inside. The only apron view is in the hallway to the washrooms. As mentioned earlier - the main function of this lounge appears to serve as a "Dining Room" for Signature Class Pax, there is minimal seating for work or lounging, also no showers or business centre. Service staff is eager and friendly. Not AC employees?

That said the food is good, about as close to "restaurant" quality that Air Canada will get, therefore a HUGE step up from the terrible food served onboard AC transpacific flights (the Hawksworth affiliation is putting "lipstick on a pig" IMHO). The vegan chocolate cake was my favourite item followed by the soup, the falafel meh.
I took some photos of the food and current menu.

At noon with HND, ICN and PEK flights, the lounge was hopping, not full but busy, hard to take photos but enough seats. I can see this being packed in early evening therefore I 100% agree that admission should be limited to fare paying Business Class customers, otherwise seating and service time is compromised, not to mention the peace and quiet. Lounge at noon was all business travellers and no families or kids. Love that

NOTES on the Inflight Experience: I do not find the "Signature Class" service much of an upgrade, garlic bread (woo hoo!) and a thin, useless mattress pad are negligible upgrades I think. The hard product is still good, not great, the person who designed that seat table that doesn't store away, therefore in the way of ones knees, should be shot.

Seat 7A is my favourite seat on the 77W. It appears to be the most private seat on the aircraft, and the quietest (the F/A's all gather to gossip in the forward galley, the door 2 galley was totally empty and quiet the entire flight, minus service times. Also seems that all the pax in the forward cabin J always used forward lavatory, the 2 Door 2 lavs were mostly unused and clean all flight long. Only minus of 7A is 1 window.