Straight Talk is fine *when it works*. But you're out of luck if you have a problem with the phone. Their customer service is the worst I've ever experienced. We had 3 phones and trouble with all of them (their phones are not cheap, either). One of the phones was down for 3 months before we got replacement for it.
I'd recommend skipping Straight Talk. We have T-Mobile pre-paid now and it is much more satisfying! We live in the sticks, so we only have Verizon and ATT signal, and T-Mobile will run off ATT now, so it is perfect.
Go on Craigslist and search "straight talk" and see how many phones are for sale!