The LS brand was only introduced in 2009 so not that many used ones out there. I believe they were labelled as "New Holland" before that. Kubota, OTOH, has been sold in the US under the same name for over 50 years.
The seat is the part I like least about my otherwise fine B2910. Besides using the seat belt, I got a memory foam seat cushion that's great. Mine is from "Everlasting Comfort" but I've also heard good thing about a similar one (with a gel layer, too) from Comfi-Life. Smooths the bumps and much...