Dual bottle adapter FX Impact

Don't want to rain on anybody's parade, but I fail to see any great advantage of having two bottles on the gun, over just having a spare bottle handy? How long does it take to change out a bottle...30 seconds? I do see a disadvantage or two; more gun weight and it won't fit in the gun case.....probably why FX never went to market with their design. 

Just got a heads up from a friend and went to this post.

Love Frank's concept. as to your experience, in 40 years as a manufacturing consultant for global companies have seen thousands of very good ideas usurped by manufacturers and they don't flinch at all.

How do I get on the list for the adapter? Any link?

Ray from PR