As others have mentioned, the lounge is comfortable for a 4 hour layover ( which given ATC delays could shrink down ) and good to have a meal, shower, and regroup before your next flight.
The rest of the terminal, while modern looking, is pretty barren in terms of amenities. There is a quite large duty free store complex as you exit security but before the main concourse, 2 Starbucks, 2 Chinese restaurants, and a few smaller shops - but frankly transiting CLE you have more interesting options.
If you have the ability to do the 72 visa free entry, the recommendations to visit the city would probably be a good one with your longer return.