i use an aqua one 320 as a fry tank for my 4 year olds livebearer offspring, i think its great once you junk the UG filter it comes with and fit a small internal (mine has a elite stingray 5) and i have a aqua one 418 open top for my shrimps, but i will be transfering the shrimps to the 320 and turn the 418 into a nano reef tank. the main tank is a juwel rekord 96 but with an external filter in place of the juwel internal.
for the money the aqua one 320 or 500 with a stand is great value and a footstep into the world to fishkeeping but the stocking level is going to be limited and more work with maintenance than say a bigger tank.