I use E-Pass for SLEX, which I pass through virtually every day of the week, and EC-Tag for NLEX, which I pass through occasionally. I load both manually -- the E-Pass through the vending machine, and the EC-Tag by top-ups at NLEX stations, since I don't pass there often anyhow. I initially considered the auto-top up for E-Pass, but I didn't want an extra charge on my card, and I didn't want to have to keep on reviewing my account to check for the accuracy in their charging.

As to the transponders, had a friend before who painted his transponder flat black. It was working well naman. Having V-Kool tints in the front windshield hampered the transponder's signal more than paint. Also, I don't think having both transponders side by side is a good idea. I remember once, at SLEX Nichols, when my E-Pass tag wasn't recognized at all. When the teller at the booth noticed the EC-tag, she then said that was the culprit. So as for not to happen again, when I go from SLEX to NLEX and vice-versa, I wrap the transponder not needed in the metallic wrapper that came part of the packaging.

I wish they'd update the terminals at SLEX, so that they don't just show how much you pay, rather they show how much is left as well.