I'm a very happy G2 user. My 3 year old son recently "lost" the 400X cam I wanted to try, so I ordered a replacement cam (as well as a 300X cam). The cams arrived promptly, but I quickly found that the cams would not work/engage with my first generation tube (the cut-out for the cam on my old tube is ovular/"football" shaped with two offset lobes, while the new gereration cams/tube have only a single lobe).
A call to G2 requesting a Return Authorization Number unexpectedly resulted in a new generation tube and a 200X cam!
And to sweeten the pot they shipped it direct to my house in Canada without need to pay duties and/or shipping.
So, a great product from a company with great customer service. Thank you G2 Ergonomics.
Dale