I have the dual Herbie setup in my 210 RR. It's been running for 2yrs+ now. I do not have my siphons tied together as I have a gate valve on each. My sump is in the basement. System works very well for the most part, different Vortech powerhead modes will create some imbalance in the system from time to time. The dry emergencies do have a trickle to them at times, so I am exposed to a very small risk of failure of some sort. I do have these on my overflows
which definitely mitigate the risk of the siphons becoming blocked. I push about 1000 GPH from the basement, which is what I want to flow through my sump. It may not be 100 percent fail safe, but I am pretty sure there is a greater chance of a seam busting or some kind of other failure then my overflow system "overflowing" the tank.