Recs.
Updated
LXQT is a lightweight and modular desktop environment that is a port of LXDE written in qt.
SpecsUpdate
Pros

Cons
Con Not a full desktop environment
Like LXDE or Xfce it is not a full desktop envirnment and is missing many utilities that need to be borrowed from other desktops which will bloat the desktop.
Con Missing Features = Lightweight
For the LXQT developers, lightweight is a synonym for missing features.
Con A lot of bugs
This is a very disappointing desktop environment, it's very buggy. Although there still is hope that these issues will be resolved.
Con Not quite ready for open deployment
In the current state, LXQT is a beta desktop that feels like a heavy alpha. A lot of the tools and underlying features are in a testing state, while the LXQT project itself has not had a gold (1.0.0) release as of yet.
Recommendations
Comments
Out of Date Pros + Cons
Con Still in early development
LXQT is still in early development, which may mean missing features or instability.
