The remote line adaptor allows you to stop relying on 12 gram co2, and from reloading at set intervals
You can use either co2 or air on the remote, it's more common for people to add this to use air
The one part of the Tipx that I see as a disadvantage is where the 12 gram is and that you are bound by that 12 gram, it's rival is the tiberius which has the 12 gram in the magazine, which enables you to have as many magazines as you like.
Each tiberius magazine could be used 3 times before the 22 gram got low and ought to be replaced. The optimum I found was 3 magazines so you can swap to your second, if you have the chance then reload paint into magazine 1, if you don't have the chance then magazine 3 is ready. Either way you switch to a fray magazine when your 12 gram runs out
The tiberius disadvantage is every time you play you use up a minimum of 1 12 gram per magazine even if you don't fire a single shot. With the tipx you don't even puncture one 12 gram until you shoot (but will because you need to chrono)
You can carry as many magazines as you like and keep switching, but still have to change the 12 gram at a certain moment
With the tipx remote line you keep an empty 12 gram in place and connect to your air cylinder, thus play a full game just swapping magazines
Either a true remote line to a cylinder on you, or a 'mini remote line' using macro line and fittings to a 13ci cylinder attached to the tipx. This detaches the tipx from you, but makes it heavier and off balance
Is it worth it is a different matter - if you are a light user of the pistol, use it as a secondary etc, then 12 grams are worth sticking to, if you plan on using it as a main and a lot then thr remote is worthwhile
One not of caution regarding the TiPX and remote air - a lot of people have reported being unable to chrono above 250fps when using that setup. The gun with chrono in the 280 region with 12g CO2, but on remote refuses to go above 250, regardless of the remote line used, or tank reg. I had exactly this problem and after searching for a fix found it was widespread.