Yes I did update it. I did that after I charged it to 100% straight out of the box. And everything worked except picture messaging!! But I called straight talk and told them I couldn't edit the apn (which sadly you can't) but after they messed around in their system, they had me factory reset with the sim still in the phone, and go through set up. After that everything worked flawlessly! I was going to use the Moto E, after my iPhone 5C shattered on its first drop from waist height in an Otterbox (It seriously upset me) but I really missed Android even after the month and a half I used iOS. So I'm back to my LG Transpyre, (which updated to 5.1.1 btw) but I'll be upgrading to a Samsung Galaxy Grand Prime on AT&T sometime this week. But both the Moto E 2nd Gen & LG Transpyre have been amazing phones for the course of time we used them. And if you can I'd highly recommend the S5. My mom absolutely loves it! The camera, battery life, screen, and storage are just spectacular in her opinion. Only the Straight Talk version of the S5 runs KitKat 4.4.2. And I don't think Straight Talk updates their phones, I've even checked Samsung Kies and it said the S5 was on the latest software. So if you don't mind an slightly outdated Android version then go for the S5. I've also looked around on Walmart's website and I've found a Samsung Galaxy S5 on Verizon with a great price. I'll look for again and put the pictures up, if I find it. I hope this helps, and that I wasn't to confusing.
Update: Seems like the AC App won't let me upload any picture attachments.
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