We have eaten here twice. Service was ok the first time. Less awesome the second.
First time: They told my wife they had something and then didn't. She was upset because she has a very limited diet and was hungry. I asked if I could try/buy a sample of the brisket and was told no. If you live in CLE you know brisket runs the gamut from super fatty to lean so it was a pass for me. Food was ok but I was surprised when giant (pastrami maybe?) sandwiches were coming out but the turkey sandwiches we ordered were sparse.
Second time: Waitress got my son's order wrong (turkey sandwich, no tomato) and forgot his salad. When she finally came back to our table (runner brought the food) she said "oh yeah. I forget it. Oh well."
Overall food is meh. The deli meats aren't great and on the turkey sandwiches we've ordered they've been stingy. They only have two choices of cheese (Swiss and American) which is ridiculous.
There are better sandwich shops with more selection, more generous portions, and better prices around the corner. I don't see Slyman's lasting. Especially when they put more restaurants in that shopping center. I'd pass.