The Kubel is pretty typical of ESCI molding back in the early '70s - a little heavy with the flash and parting lines;s bits are a bit out of round/square; some parts may not be perfectly flat; and a lot of sub-assemblies are molded in halves, so there's a lot of cleaning and dressing those bits, which can slow down the build, depending on how picky you want to be.
The old ESCI kit was molded in a few different colors, so there were tan, black, and metallic colored sprues. Italeri has molded theirs in the standard grey, which makes things a bit easier. They also cleaned up the instruction sheet to make things much clearer and easier to understand.
I'd noticed that a lot of the body panels were relatively free of ejector pin marks, because a lot of those marks wound up being located on the mating edges of the parts. There are both raised and recessed marks, so test fit often and adjust the fit as necessary before reaching for the glue.
Speaking of glue, consider using either a thicker glue or sprue-goo for larger assemblies. I used the goo and it adds a lot of strength to the joint, as well as greatly reducing the amount of putty I would have otherwise used.
Overall, it's a pretty well detailed kit, but considering the sheer size of things, it's a prime candidate for super-detailing if you want to test your scratch-building talents.