I have noticed that my account at We7 is showing that I have 1 ad free day available and that this is 100% of what is possible. Previously they allowed you to earn up to five advert free days by listening with ads for a certain period of time. I had noticed it being reduced to three and now its down to one, so it looks like they are moving to removing ads only if you pay the subscription.
I did try the free trial subscription for my android phone, but found that the player crashed fairly regularly. It was quite nice on other ways as it stored tracks on the SD card so that if they were requested, but had previously been listened to they ran from the card rather than using bandwidth. In the end, though, it was just too annoying so I did not continue it with a subscription.