Thank you Sir for the detailed explanation! I appreciate it. See, I would've thought a chain tool and pin would've been in a bag or basic tool kit. Although, it makes sense now especially when I was researching group sets and found out Campy's chain tool was nearly $200!A link makes it easy to disconnect and reconnect the chain. Otherwise you would need a chain tool and a new link pin, (which presses in with the chain tool, like a rivet). Once a pin is removed it must be replaced with a new pin and pressed in with the tool. For example, when installing a new chain you need to size it first, install, then connect. The link makes it easy. Go to the Park Tool web site for instruction videos.
A link just makes it easier. I have found it wears about twice as fast as a chain, so I normally replace the link one time without replacing the chain.
The Ultega 6800 11 speed group needs a different chain tool to reconnect the chain than the 10 and lower speeds. Also the hub on the rear wheel is larger than the 8-9-10 speed hubs.
Thanks. I will keep an eye out for a link when one if/when it becomes available. For now, I will most likely get the Shimano tool (TL-CN28). Lot more reasonable in price than Campy $200! I can see the advantage of having such a link.On my non 6800 chains, when replacing the chain I would size it down using the chain tool, (which comes on some multi-tools for far less than $200), put it on the bike and connect the ends with the link. The 8-9-10 chain tools should be able to push the pin out of a 11 speed chain, at least I've read that, but cannot install a pin, hence having a link would be nice. But, as of now, there isn't a link that fits the 6800, at least as far as the link manufacturers say.