The words that are missing on the description are "glass mat" - there is an acyronim for this, I forget what it is...
For a motorcycle you want an OEM replacement - the glass mat is just what it sounds like, fiberglass matting (padding) between the plates in the battery that make it more rugged, and keep pieces of one plate vibrating loose and shorting to the next one.
I got my last battery from... I want to say Battery Shark website.. It was only around $30 4 years ago with free shipping. The have regional warehouses across the country, it only took a few days for it to arrive.
Lead acid glass mat motorcycle batteries are a very mature product - which means there are a lot of people making them, making them very well, recycling the lead nearly 100%. The one I got for my 650 was made in Vietnam and I have no issues with it. Im due for another one next spring (4 years) and that is my plan.