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Bought a pair of the Champion 2500W dual-fuel models and like them so much, I decided to add dual-fuel capability to the pair of Honda EU2200i units we have with the intent of running them solely on propane going forward. The ease of using propane compared to the hassle of getting and keeping fuel stable makes this an easy decision. Since propane bypasses the carburetor, maintenance is simpler, and reliability should be better. For a unit that is run sporadically, getting the carburetor out of the system is a huge plus. No more gunk in float bowls and jets. Also no need to be stuck in lines at gas stations. There was no line at the local Ace Hardware we use to refill propane tanks. Propane ages well, especially compared to gasoline.
Since propane burns cleaner, the oil stays cleaner. The one performance negative of propane is the unit delivers about 10% less power. The financial negative is the cost of propane per watt is higher than gasoline's and the acquisition costs of additional tanks or tanks that have "aged out". We have three tanks now with a fourth scheduled to be purchased. A possible concern is the propane expanding as it leaves the tank can freeze the feed line in very humid conditions. Some warm water or warm air flow can mitigate this issue.
Hutch Mountain has a conversion kit that is easy to install. A little pricey but well worth it due to the maintenance hassles it eliminates.
https://www.youtube.com/watch?v=_sopyBEQmTE