I have installed both bumpers, the Calmini and the ARB Bullbar. Both were on 95 4 doors. Both were winch bumpers. From what I've seen between the two, the ARB mounts far superior to the Calmini. The ARB mounts to a heavy mounting crossmember that uses only the two upperbolts from the stock bumper mounts, uses 4 other bolts to hold the crossmember on the fron tof the frame, and they are all 1/2" bolts. 2 go in from the front down through the lower crossmemberfrom the inside using very heavy washers, nuts on the outside. The other 2 bolts go through the upper ends of the frame rails, THROUGH. They are drilled through frame rails and the crossmember has holes on both sides of the frame so the bolt goes all the way through 4 layers of steel on 2 frame rails!
Then there's the Calmini bumper. It is a very heavy bumper, that is honestly heavier than the ARB, but I think that part is debatable. But the mounting? SUCKS! It only mounts using the 4-8mm bolts that hold the factory beer can on. How is that strong enough for a side pull from a winch?
Calmini, what were you thinking? You made a beautiful, somewhat affordable, stout front bumper made in the states, that mounts like a$$! What's up with that? Why no extra mounting to help with the strength? Not like it would be a big deal to factor into the design.
That's my input, and gripe. Hope that helps.