Soundclick, Soundcloud, Box, Reverbnation, and a bunch of others.... they all work well. Some have limits and pecularities but they are free. Work around the limitations and find others without those limits..... That's one reason I started using Box.com since the size limits are much much larger.
I would not pay for the services to host my music because they are making their money from adverts.
Exposure....?? Only what YOU personally can give the song by advertising it's presence on social media to your list of friends and fans. Beyond that, if you are paying them to promote it..... remember that thousands of others are likely doing the exact same thing..... so you're at the "front of the line" so to speak with thousands of other musicians .... more like a mob than an elite group.
When I signed up, of course they offered the premium services and I simply clicked no... just give me the free service. I just need a place to store my songs and let people hear them from time to time. Nothing else, Thank you....!
As far as the ratings of Soundclick...... no one should take that seriously. I have had a number of songs that reached #1 in sub category and placed rather high in the main category as well...and it looks impressive to see that there are 76,324 other songs in said categories...... however, when you realize the truth, that it only took 57 plays of the song to get to #1....... hummm..... not exactly like having a Billboard top 40 tune......