Nexus 4, Straight Talk

[Karrott9]

I'm currently paying $90/month on T-mobile and I am looking to switch to Straight Talk after getting my Nexus 4 and paying a $200 ETF. I really want to know if Straight Talk is reliable? I've heard the concerns about the data, but I am usually always connected via wifi so data cap is not a concern, unless for some dumb reason Straight Talk says no to wifi. Which I doubt. Can you all tell me any pros and cons to Straight Talk? Any concerns I should be aware of? I've heard of there threats to terminate service after long periods of use... Can I still make purchases from the Play Store and Amazon App Store? Can I buy both a T-mobile sim and AT&T sim and switch them as often as I like? Any first hand experience from Straight Talk would be appreciated!