I picked these up on a whim as they were free!
Free - always good
Attractive - The art is nice, and they've been shaded
Variety - three different designs, in three alternative colours (plus uncoloured), with two different terrain bases
Upgradeable - If you play Mech Attack these stands can be upgraded with heavy/special weapons (but see cons)
Basic - as a sampler, you don't get the heavy/special weapons upgrades with this pack
Samey - the three different troops types are very similar, and even with the different cover terrain, its hard to tell them apart at a glance
Limited - The figures face all four directions, and come on a hex base, which means you will need to do some work if you want to use them for other games than Mech Attack.
Overall though, a great product. I'd recommend taking a look even if you don't think you'll use them.