Straight Talk. $45 Unlimited HSPA+

I currently have Verizon and am using a HTC Trophy. I pay about $80-$85 a month for slow 3G service.
I am considering buying a Samsung Focus Flash off Amazon for $260 + a SIM for $15 for straight talk. I would be paying much much less than I am now.

My question is: Do You use or know anyone who uses this service? If so how is it?