I have been running one for 2 years. This is what I wrote on another forum regarding it. Definitely worth it imo...
Here are the advantages imo..
PROs
1. Reduced wiring/switch/relay work during system install
2. More solid runs at tuned 950psi (8-10 solid runs @ 100whp jets/10lb bottle) therefore more N2O used and not residual leftover.
3. NANO has mini gauge which can be used to determine how much N2O in bottle before refill
4. Safer...no accidental "ooops I left the heater on"
5. Puts you at or near tuned psi instantly, eliminating wait times for warm up.
6. NANO fittings are the same as paintball gun equipment so easily sourced. Also you theorically could use it to power a semi automatic paintball gun during the off-season...(but I digress, lol)
CONS
1. Hot summer days will require you to chill-pack the bottles as environmental heat over 87d F will increase your starting PSI. That is why I have velcro straps around my bottles for chill blankets.
2. 3000psi kit is easier for refill locations over 4500psi. 4500psi can be filled at paintball\scuba stores and is a smaller bottle profile where space is a concern (i.e. roadster trunk)
3. Cost to refill NANO is 3-4$ so ongoing spend when compared to warmers.
4. Bottles will need to be re-certified after so many years (maybe 5?)
5. NANOs should be slightly overfilled (i.e. 3500psi) since you lose up to 500psi upon initial opening to hit the checkvalve on ur 10LB bottle.