Hi I own one and like it very much. I use it for high power planets and Moon, and lower power DSOs. I have the qty 3 Glaspath Correctors for it, and use all of them depending upon conditions, etc. I am very happy with my Baader MK-V. I have never tried the less expensive model.
I tried the Mark IVs, the TV, the Denk, and the Earthwins. In my experience, the tier go like this:
Everything cheap with 20 - 22mm exit pupils Cheap units supercharged TV Earthwin Denks Baader IVs or Vs Siebert 35-40 Siebert 45s
I've tried all combinations, and now am using Siebert 45s. However, i will say that if I went to the 1.25 format I would go with the Baaders. The glasspath correctors and the T2 are so convenient, and in my experience the views were really clear. Second would be the Denks or Earthwins with the Switch.