Which mecanum wheels to buy?

[cad321]

I'm looking at getting some mecanum wheels to play around with in the off season but want to ensure I'm buying a quality product. I was just about ready to commit to some of the 6in vex pro ones but after hearing about the issues with the 4in wheels, I am now wary. What have you had best experience with/ recommend? The reason I was going to go for the vex ones over andymarks was due to both the weight, price and I also like the versa keys. However if the rollers/wheels are going to break or wear out quickly, id rather invest a little extra more and get the andymarks. Thoughts, Concerns? Other recommendations?