You have the same cage I used to have for my past hammy, Foxy. Good memories.

Personally, I've never been a fan of those interconnecting tubes. They're absolute hell to clean and get stinky really quickly, expecially in summer when in gets hot and humid in those things. Plus they break pretty easily. Another thing is when you have a nervous or new hamster in a cage with tubes, they can easily evade you catching them!

If you think your hammy needs more space or more exercise, with summer coming up, maybe get him/her another cage which you can take outdoors with you for a bit each day. I do that with Tia with weather permitting and she loves it. I know that cage you have is fairly large anyway, as far as hamster cages go, so I'm sure your hammy still has plenty of space to have fun!