I've heard this place has been around since the 60s so I'm sure they're doing something right. I like the simple menu and options, it kinda reminds me of In & Out burger in the States.
Each item is decent on their own but the onion rings were my favorite. They advertise their patties are fresh never frozen ground beef but that may have been when they opened. The ones I had were definitely not as advertised. I can understand that they would make the change since they are serving approx 4000 patties per day. The time and cost of making that many patties a day would raise their prices a lot.
The shake was definitely thick and used real ice cream. I can tell because I'm slightly lactose intolerant and real ice cream affects me every time.
I will go back to Peters but I will lower my expectations and therefore enjoy my experience for what it is.