The Good: 1. Nice stable platform to work with when you're not clipped in. 2. Effective rotational allowance reduces strain on the knee. 3. For the couple of weeks they were on the bike they seemed strong! 4. They look awesome and feel good underfoot.
The Bad: 1. YOU CAN NOT ADJUST THE RELEASE SPRING! 2. Multi-directional release. It's important to me anyway. 3. Weight, but probably not as you're looking at a platform.
I imagined the Time Z to be the be-all-end-all pedal, but they unfortunately ended up in my stash and are nearly new still. I was really looking forward to the nice platform and extra support but the retention system just didn't cut it. I've had many SPD pedals, and had always heard that these were a great pedal and yes they are good. The pedal itself is strong, entry easy, and release is very similar to Shimano with the single release cleat. So if you're coming from a Shimano pedal to try them and you've been running a single release cleat, you will be happy with these. If that were the background then they are a 5 star pedal.
I, however, prefer adjustable tension which Time does not offer. Since the pedal tension can't be adjusted and because of the multi-directional release I'm giving them 4 stars. The rest of the pedal is really nice and built to take a pounding.
This review is based on my experience with it. Your experience may be different. Good pedal.