Golds Gym Cardio Workout remains probably my favorite workout game for Wii, with Samba de Amigo a close second. With both games, I play them while wearing wrist weights-- the workout is very intense. When I was playing this game regularly, I was really building muscle.
Also with both games, it's key to remember that the punch or shake is determined by the controllers sensing a change in acceleration. So to punch, draw back fast.
I only care for the main Shape Boxing mode, and I haven't really explored Exercise or Exam (there just isn't much there). The game tracks your total number of punches, which is impressive. I don't care about unlocking new clothes, etc. for my avatar, but it's nice that I don't have to use my muscle tone-less Mii.
The prepared workouts are a nice feature, but I go "a la carte" as well.
The graphics are good (better than Wii Fit), and the on-screen buttons are large and easy to select with the Wii Remote (unlike in another Ubisoft fitness title, My Fitness Coach). There is some weirdness, like how percentages have a leading zero ("067%"), and the trainer says the same things a lot. The calories burned count makes no sense at all, but the fitness age calculation makes me feel good (if only it knew I added resistance!, I boast to myself). All of the music has the same tempo, so I don't really enjoy selecting what track to play (I just go with Random usually). These are just quibbles compared to the software's very solid Shape Boxing workout.
I live this game. I didn't even have it a day and went out and baught it. I love the boxing part of it. I have not completed every level yet. I'm hoping there are more excercises other than boxing. when everything gets unlocked.