I can see that problem with the loader, these sized rigs are definitely a little lighter on their feet so that can be an issue. I'm sure the cement box works well, but having a 3-point attachment or backhoe works well too
As far as disappointment, perhaps that's a bit of a harsh word. I had to go through the same thing and it was more like an unrealistic expectation for the machine. When I first went to dig into my back yard and lifted the rear end up before the ground broke much, I was a bit disappointed. After using it a bit I realized that, being my first tractor, I set my expectations a bit higher than I should have. Still, I feel like it's a good thing to have those moments because it teaches me the capabilities and limitations of the machine.
Before I bought my rig I went back and forth over getting the Deere or Kubota, to the point where I had quotes from several dealers (local and out of state) and even scheduled test drives. I settled on the Kubota partly because I got a better deal than the Deere dealer offered me but also because the dealership I worked with had much better customer service than the Deere dealer. I'm sure if I had gotten the 1026r in TLB form I'd be just as happy with it, seeing your pics just goes to reinforce just how capable these machines are.