There is one con to using a bubbless system for controlline but its certainly not "uniflow". That con is I believe the weight may be marginally higher. That's something I am definitely willing to pay for given the tremendous advantages over conventional or uniflow. That includes effortless setups without all the testing and angonizing over uniflow.

Now if one uses throttle such as scale folks or those gimpy folks like myself the bubbless is far superior. I also use them on some problematical rc airplanes. For example I have one four engine and one six engine airplane that during certain manuvers such as a roll the outboard engines surge in and out due to all the weird forces way out there on the wings. Originallly used conventiona tanks but replace all with Tetra's and that problem went away like magic.

In my opinion the bubbless systems by either Jett or Tetra is far superior to any conventional type and that includes all the uniflow schemes.