I picked up my A5+ during a Black Friday special Audioengine sponsored a few years back. I was planning on getting the A2's but the savings on the bigger speaker was too good to pass up.
In my haste, I overlooked the technical detail that the A5 is rear-ported while the A2 is front ported. For now, that isn't a problem for me but if my desk was smaller and my speakers were against the wall, I'd have to make some decisions.
So, the rear-ported speaker needs some room behind it to get the most from it.
Great speaker, for the money. Very happy with mine.