Cheap can be OK, and I think you've found it, if the battery is rated at OEM specs. A lot of the difference in battery prices is warranty length, and in some cases the higher price is just paying for a longer warranty on essentially the same battery, on top of brand name marketing costs. Over the longer term, it could be a matter of buying two $70 batteries vs a $140 battery that lasts twice as long.
I wish somebody made a cheaper version of the lawn-tractor sized battery Honda put in my Fit, because Honda wants more for that one than I would pay for the cheapest Group 65 for my van, which is at least 4x the capacity.