As a salt solution it has a reasonable operating range it which solids are not formed.
LiBr-water has a high volatility ratio (separate easily) so it can operate at low pressures and at low generator temperatures.
LiBr has a high affinity for water (It LOVES water). Though this has a little disadvantage in that the solution has a higher heat of dilution.
It has a moderate operating pressure.
It is quite chemically stable.
The solution is only moderately corrosive (can be helped with inhibitors)
Fairly non-toxic (LiBr was used at one time as an "anti-depressant")
Non-flammable
Solution has a fairly reasonble viscosity
High latent heat
From the above list - the main disadvantages of the water–lithium bromide system include the possibility of solid formation, low operating pressures, and higher viscosity. However, the advantages (i.e. high safety, high volatility ratio, high affinity, high stability, and high latent heat) outweigh the disadvantages, thus resulting in its extensive commercial use.