systemlink and back boiler stoves

Any plumbers out there that used the systemlink arrangement with a boiler stove combined with a kerosene boiler? Any info appreciated.

What do you want to know/do?

Have you installed, any problems using the system link etc. Also some stove manufacturers are are stating max 8m combined flow and return in order to work properly. There's alot of explaining to a customer the amount of extra work there is in installing a dual system properly taking into account the limited benefits, cost of solid fuel, output of solid fuel, the fact that the stove must be lighting for quiet awhile to get any benefit.