I bought a genie 50' platform height (56' working height), the TZ-50. It hasnt yet paid for itself, but its well on its way. Its advantage over a full on rig is its only 5'6" wide when stowed, only weighs 4300 pounds. It has 30' of horizonal outreach. It wont go over center on either boom but it does have a 4' jib on the end of the primary (extendably) boom, it can operate on gas or batteries.
Its downsides are it takes another vehicle to tow, isnt as fast as a full rig, the height is a little less than a 60', and the boom isnt insulated.
The pluses are it can get to alot of trees around here, has the height to get most trees to a floppable state here, weighs alot less so it does alot less damage to the lawn and is easy to move. It can operate basically silently, costs a few hundred a year to insure, it has an extendable primary boom with a jib on the end allows it to get into some unique positions. It has a 500lb unrestricted capacity, one outrigger cant put more than 2830lbs on the ground or 30psi. It takes alot less maintenance than a truck mounted unit.
The price new is $27,000, its way easier than climbing, it really shines when you have multiple removals at the same lacation, i slayed 5 trees between yesterday and today, suppose to take one day but the chipper fragged on me. Last week I removed an oak on monday, thursday and friday I removed 4 pines in a tight area. Sure I could have climbed them but I like getting home and not feeling totally worn out, having some energy to spare for some of the finer things in life. When its not being used it doesnt break the bank, its easy to tell if it will save time/money/effort on a job when I bid it. Another handy thing is having different places across town to let it spend a night so you dont have to make a special trip to get it, assuming you have a schedule to follow. With its outriggers down its ???? near hard to steal, not very easy to operate for the untrained.