The LED on the ZEIKOS is thoughtfully put. It won't light up if no card inserted. It flashes when the card is accessed (read/write activities). After you right click on the disk and select "Eject", the light turns off so you know now it's safe to physically remove the card. The SUNPAK never worked reliably enough to be usable, but its LED is "solid" - it's always on as long as plugged in, it never flash, never turns off.
I have returned the SUNPAK and bought two more ZEIKOS. I have used them on all my computers - laptop, tablet, desktop, Windows 7 and XP, never a single problem.
Watch this Youtube to see how the $4 ZEIKOS work beautifully: