Now we're on the same page.

I did not check every single Husqvarna model, as I was only interested in the 48" deck, but the GT48DXLS was the only model I found with a manual locking differential. To most people, that's not a big deal. To me, it was a minimum requirement - that or 4wd. I preferred the manual locker so that I could use it as needed, and release it quickly to shorten turning radius. For me, this is the unique model in their lineup that meets my needs - so it is special to me.
Husqvarna makes a broad range of riding mowers: LTA, YT, YTA, YTH, LGT, GT, and probably LGBT. Decks from 42-54". Engines from Briggs, Kohler, and Kawasaki. Transaxles from plastic garbage to some of TuffTorq's better stuff. My dealer just started with them this spring and has already sold a couple dozen units. The only problem one was a plastic transaxle - which the dealer believes will not be continued next model year. All that model shares with mine is the paint color.
The YT48DXLS vs the GT48DXLS is an interesting comparison - different hp, frame, differential, and tires/wheels, but only $200 difference in MSRP. It's all in the details.
As broad a range of riding mowers as Husqvarna makes, there's bound to be some that stink like melted plastic. I admire Deere in that regard - even their box store price-point models generally survive the warranty period and are adequate for flat lawns.