Is Spotify worth it? Can you save the songs?

My guitar teacher actually suggested that I download Spotify. I'm a HUGE Pandora user. I like it for discovering new music that's the genre and sound that I like. I always end up buying all the songs I like on iTunes though. I buy songs A LOT. I've cut back lately but I have a HUGE list of songs I'd like to have. I USED to spend over $10 a month on songs from iTunes.

So yeah. I just got the Spotify app for my iPhone and I'm loving it so far! I'm currently on the 48 hour free trial… Can someone explain this to me? Does it mean that I'll still have the songs that I put in my playlist after the 48 hours is up. That I just can't make new ones or add more songs after the trial is up? But I can still listen to the songs that I already have?

Also. I tried to sync my playlist but it won't get past the first song. I'd really need to have access to the music outside of my house or places with internet. Like in the car or on a plane. I liked iTunes because well… It's kind of made for Apple products and you basically own the song and you always have it available to do. I wouldn't want to become a member of Spotify and have to pay for it monthly and not be able to have access to the songs whenever I want.

My guitar teacher said that he's able to basically save the songs directly on to his computer. But has a PC and I have a Mac. Can I still do that? Is there some way that I could get the songs in my iTunes library?

To me… Spotify would be fantastic because then I could have all the songs I want and not be spending nearly as much as I would on iTunes… But I wouldn't want to do it if I can't access the songs while I'm out or on a plane or road trip.

So is Spotify worth it? Is there a way to save the songs? Why won't my playlist synch?

Okay, so the good news is that when your 48-hour premium trial or whatever they call it ends, you'll still have all the stations that you saved and everything. Once it's over there'll be commercials every now and then, but if you want you could download spotify on a desktop or laptop. You only have to pay for premium if it's on a mobile device, like an ipod.
As for the reason your songs aren't syncing, it's just because you need to be hooked up to a Wi-Fi connection to use spotify whenever, i assume. To be honest i didn't really get what you were asking at this part, but i hope at least the first part helps you.