Penguin United claims that charging four remotes simultaneously can take up to 4 hours on the Quad Charge Station. This estimate was on the money, and in our testing we were able to charge a single remote in about 2 hours. In terms of play time, Penguin says each lithium Ion battery will provide 13 hours of use. The remote fits very snugly into the charger--in fact, the base makes for a great way to store your remotes when not in use.
The actual contacts on the base feel a bit flimsy-- they're just a loop of thin wire. We never had any issues in our testing, but we question their durability over the long term. We really liked the charge indicators in front of each charging dock. Four green LEDs represent 25 percent increments of the battery's charge. This also comes in very handy when you just want to quickly see how much juice is left in a remote.
Overall we liked the Penguin 4X Quad Charge Station for its capability to power up four Wii remotes simultaneously, its visual charge progress indicator, and the convenience of having the batteries built into the covers. Priced at $45, it should be the only charging solution you'll ever need to buy. That said, if grip is among the most important details to you, and you don't plan on using more than two Wii remotes, you may want to stick with the Nyko Charging Base, as those grip covers are among the best we've used to date.