I received this product today and though I therefore cannot speak to how well it stands up in the long term, so far I am satisfied. I was unsure if I wanted to order this holder because I wasn't sure my player would fit in it, but I decided to give it a try since the price was better than anything I could find in stores.
I have a Samsung Galaxy Player 4.2 and needed a new belt holder because the velcro on my old holder had stopped holding. My player DOES fit in this holder, although it is a little tight. However, I have noticed that it is already loosening just a little, so I think a few days of using it will stretch it slightly and allow the player to slide in nicely. However, the placement of the sides of the case mean that I can't reach the headphone jack on the player. I might be able to after it streches a bit; we'll just have to see. It's not a big problem for me because I have a bluetooth headset, but it could be a problem for some people.
I read reviews of this product from another seller in which people complained about the size of the card holders. I tried all four of the holders, one viewing slot for an ID and 3 regular slots for cedit cards. All of them fit my cards fine. I put two cards in the slots and used the third for some cash and had plenty of room. I also put 2 full size SD cards in the sd card slots while all of the credit card slots were full, and had no trouble with room; everything fit fine. Finally, I also had room for a set of headphones and a chapstick just stuck in the case. I'll have to be careful not to dump them out when I open the case, but it's nice to have room for them.
People should be aware that, due to the dual nature of this holder (player holder and wallet) it does stick out further from your side than regular belt holders do. I can imagine there will be times when I use my old belt holder instead, just so it doesn't stick out as far, but this one will be very useful for when I don't want to carry a purse.
Again, I wanted to write a review to let others who want to use this with a Samsung Galaxy Player 4.2 know that the player WILL fit in this holder, though you may have trouble reaching the headphone jack. The 5.0 player would definitely be too big, though.
Overall, I'm very satisfied with this product and the seller. The product arrived earlier than estimated and was in good shape.
UPDATE: Still very satisfied. The pocket for the player stretched a little so it still holds the player securely, but allows me to slide the player, with a case, into it fairly easy. Also, I discovered that if you slide the player in with the power and volume buttons towards the floor, you are able to access the headphone jack. I just wish the clip was a little tighter. It's pretty secure, but when I wear jogging pants, sometimes the holder will slip off my waistband if I bend too far. Other than that I am extremely satisfied.