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The S4 charger outputs 2.0 AMPS so if you used a charger with less punch, and the correct cable it would charge slower for sure but it should charge. You should be careful about the cable, there have been reports that using a different cable that looked the same didn't work and that's where you may run into a damage issue.
USB output as far as the USB port on a computer is standardized....at 0.5 amps. So trying to recharge a phone using just the USB port on your computer is painstakingly slow. My older Motorola chargers output 0.85 amps. My older HTC chargers (for the Rezound, etc.) outputs 1 amp.
I'm not sure on the specs of the chargers but my Bionic charger charged my S4 just as fast as the S4 charger does without any issue and my extras for cars work fast as heck also , sounds like the sales rep was trying to up sell you.
I think you mean 5.1V versus 5.0V. Generally speaking, computer power supplies and USB phone chargers are rated at 5.1 Volts, +/- 10%, so .1V is well within tolerances and wouldn't have any negative impact on the phone. Most newer phone chargers are rated in the range of between 750 mAh (milliAmp/hour) and 1 Ah, where most tablet chargers are closer to or at 2 Ah. I hear that the S4 charger may be rated at 2 Ah, and reports are that it charges very quickly which would make sense given the faster charge rate.