I'm running LM 12 lxde-xfce 32-bit on my 5-year old MacBook and have not experienced any significant problems at all from burning the ISO image on a CD to installing.
The first thing I noticed is how much faster it runs than the main edition once it boots. On the other hand, it boots slower than the main edition, but I can live with that. I'm still experimenting a bit with some desktop options. For example, when logging in, you have the option of selecting default, lxde, mint-lxde, or xfce desktops (but you have to install some of these packages from Synaptic first). For some reason, which I haven't figured out yet, the xfce desktop doesn't load, but I'll check the forums for a possible solution. In addition to the speed, the UI seems much cleaner and clearer.
Some users have mentioned CPU and RAM issues on other LXDE threads, but I haven't experienced them. Since I loathe Pulse Audio, I installed Gnome Alsa Mixer and unchecked the muted sound boxes in the GUI and adjusted the volume, which immediately solved the usual sound issues that often accompany a new install.
Another thing that I love about LXDE is that both my wired and wireless printers worked out of the box after the initial set-up!
With the LM 12 main edition, I've been unable to configure the wireless printer, which is another story.
In sum, I like this version so well that I've replace the LM 12 main edition with it on the laptop. Enjoy!
System 76 Pangolin: 4x Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz, Manjaro 0.8.12 Xfce/Cinnamon 64-bit
iMac 21.5: Intel Core 2 Duo 3.06 GHz, dual boot Mac OS 10.6.9 and Manjaro 0.8.12 Xfce/Cinnamon 64-bit
It's never too late to learn something new.