The problem with Strsight Talk is that they will not roam on other networks. For example, if you have a Straight Talk phone on Verizon network, it will only work on verizon towers. Unfortunately, this leaves you with huge gaps in coverage especially in western ky, northern nc, wv, md. If you go on verizon.com and check the coverage for prepaid phones, you will see all the areas where it will be roaming, meaning that your straight talk phone will not have signal.
I tried the verizon version, but had to get rid of it. Driving north on i65 out of Nashville you loose signal as soon as you cross the ky border and you dont get it back until you reach Elizabethtown. That is a huge 2 hour gap with no signal whatsoever.
At&t and T-Mobile dont work at my house so I haven't tried those flavors of straight talk.