You could just upgrade the washer tank to the larger size and run the water/meth from that...
Honestly, it's like an upgraded exhaust, an FMIC and a mild (5-10%) bump in power, and potentially boost/egt gauge all in the one install- saves money at the performance shop. It gives you more power, makes it stick around longer, clears up smoke and Nox (so you can kill your EGR and not have to worry about intake cleaning without feeling bad about polluting the environment)... it's a good upgrade, so far as I've seen. I've not read too many negative things about it aside from people who don't own one, but heard third hand that someone's cousin from turkmenistan doesn't like theirs, or people who've not demonstrated that they owned one/talked about it before, saying that it's not worth it 'cause they super serious had one before but just never bothered to mention it before. It seems like a scary prospect, injecting water and foreign fuel, but it's been around longer than most people who criticize it. Tried and tested as true- it's a great backup for fuelling mods, and it will lower your EGTs- you're vaporizing a cool fluid, and absorbing energy by doing so... physics.
The ability to get the controller with the boost+pyrometer functions is a good enough reason to consider it early on- typically more aggressive stages of chips won't be installed on cars without them, so why not get it out of the way?