I never liked Lxde but this is really a good distribution. Fast, lightweight and all the programs you need. After installation and updates it only use 2,25GB of disk space.
No downsides? Yes and no. If you need an office suite you have to install Libre or Openoffice, Lubuntu comes with Abiword and Gnumeric, but for most people the standard programs are just fine.
If you like Linux Mint Xfce you’ll sure like this one. It’s a pitty that Linux Mint has no Lxde version anymore.