I still prefer the Titan Inflatable Exhaust Jack; and it only weighs ounces, not pounds. Plus it doesn't require specific lift points on the vehicle for jacking and works great on sloppy uneven terrain (mud; soft sand; deep snow; sideways on a hilly slope, etc.), and won't fly-off and hit you in the face like a hi-lift jack will when it loses its footing.
I don't disagree with that really...but I guarantee you an exhaust jack would not have been able to jack my rig high enough to replace a coil spring, as I have had to do a number of times (not anymore though, if I can help it).