I recently switched from Verizon to Cricket to save some money and went from a Galaxy S4 to a Galaxy Express. The S4 was snappy, no lag opening apps, unlocked right away and so on. The Express would often lag switching apps or even unlocking the screen. When I had it synced via bluetooth with my car stereo and I would skip a song, it would take 3 or 4 seconds to actually skip, where the S4 was instantaneous. I know it seems petty, but when you're used to speed, it's hard to go back. I ended up biting the bullet and getting a Nexus 5. Life is good again.