That is definitely an option but not the one I went with. The option in the link you posted looks like it supports the dock connection, which is good for the iPod, iPhone, iPad users, and RCA connections that can be turned into an AUX input with an extra cable. It will charge the device and you'll be able to control it through the FJammer or regular radio.
The option I went with though was from a company called iSimple. My model is the ISIM71. It's an older model but it gave you 3 connection options.
1. Dock connection - Device charging and control by radio
2. Aux input - for apps that don't want to output audio through dock (pandora,etc.) or other types of devices with headphone outputs
3. RCA inputs - like aux input but for devices with RCA output (game consoles)
I don't find myself using the RCA input much, if ever, but the aux input is great and obviously I use the dim connection.
They don't make my model anymore though you can still get it online with a bit of searching. But the new model is the ISTY571. I believe it's just an updated model for the new firmwares. It still offers the same 3 connections listed above. Check it out in the link below.
It should be said that the iSimple kits require the FJammer while the one linked works on any radio.
Still, out of all the kits I've seen available, this seemed to me to be the complete package for the best price.
2008 FJC Sandstorm :: Icon Ext. Travel Resi CO's :: Icon Piggybacks :: Icon UCA's :: Demello 3-Hoop Bumper :: Demello Hybrids :: 285/70/17 Firestone Destination M/T's :: Spidertrax Spacers :: Black'd out