They are playable
I found a Chromax ball on a course a few weeks back and played it for a couple holes and thought it was OK. I didn't look at the model, but thought I would buy some for the fall since I have trouble finding golf balls in the falling leaves. That ball was very visible, especially if the sun was out. I bought the M5's thinking they would be good. They are also OK, but don't feel as good as that ball I found. Visibly, there are air bubbles in or under the clear outer cover, injector or ejector grooves in the cover, and they are harder than expected at 75 compression. I have a very hard time controlling them off my driver compared to my normal ball, and I can't get them to check up on a green at all. I few times, I chipped the M5 and my normal Bridgestone E6 from the same spot, and consistently the M5 rolled out more than 6-12ft further than the E6. I also found they were a few yards shorter than the E6, even off wedges. The biggest issue I had was in putting. They are very clicky off the face, and about half of them do not roll very straight. They have a wobble, almost like a bowling ball where they roll straight a couple feet and then come off center in either direction. Not horribly, but enough that I missed more than one putt I normally wouldn't have. On the other hand, I only lost one ball, which spun wildly off my driver into the woods. Even shots into blind areas, once you have a view these thing reflect and shine like a mirror. They are awesome that way, but certainly not as good for playability. So, I gave them 3 stars because they do the main thing they are designed to, they are extremely visible - way above average in that category. Everywhere else, they are better than a true novelty ball, but below average for a ball at this price point.