Hi there,  I have OTS 100W. I used to play on stage and home studio, I love this amp and I have something to compare as I also own a Boogie Mark One, a MArk III, a Boogie Caliber + 50 w, Fender Delux Reber Amp 65... Just to say  I love my OTS not like if it was my only one amp but cause it is a real crazy well done. So as I moved from home to a boat.. and palying only on small stages like bars, restaurants and boats, I order a Lunchbox. I have not the 2 amp side by side to compare sound in direct for now, but I can confirm you you cannot be disapointed with Lunchbox. The 20 W seams really under reality. You will probably never be able too crank it up at home. As for the sound I believe the OD chanel is little bit more dirty easely and there is a fantastic OD trim on the back that I have not in the OTS. The clean chanel in my opinion is little bit more clean than my OTS too. So you can change you excellent 50 w for the OTS mini without doubt in your range of use. Regarding the weight and your herny disc issue, I suggest you buy a head and a separate speaker cab as you can take one in each hand and be balanced. The commun head cab is 5 kg and if you DIY you can divid it or ask Nik for a head cab option in carbon for 1 kg eheh... hope that's help !