Yes, I do. It stands in the hallway at the moment, ready to go if I feel the urge...

I have been using the SLIK legs with several heads, including an Arca Swiss B1 and right now it has a Manfrotto 029 (229 in the US). The Sinar Norma 5x7 I have works fine with the tripod. It worked with a 4x5 Horseman LE and the telescopic rail, but I thought it was pushing it slightly with the 029 head. Anything from 4x5 up to 8x10 works well. And with a less heavy tripod head than the 229 (weighs in at over closer to 2 kg in itself!) I guess the legs will do at least 5-6 kilos easily.