I had the Combo 121 Lite Mk I, the Combo 121 Lite Mk II and the Super Combo K1 : all three fantastic combos with a preference for the K1 that was not as hissing as the two others when cranked up (and it can become very loud), but is heavier.
I sold the 3 of them and now my back is telling me to go back to a lightweight combo... which is what the 121 Lite Mk II is.
GLWYS.