I agree with Peter’s comments. That graph he gives is very useful in judging what to expect with achromats. I would expect the chromatic aberration in the 127mm f9.5 to be quite intrusive, making it rather non-ideal for lunar and planetary work.
I haven’t tested these Bresser telescopes, but generally Bresser have a lower reputation than Skywatcher and Celestron – deserved or not – and much lower than Vixen (whose style they look to be imitating with their white paintwork).
I have some words to say on this subject in the December Journal, which will be out shortly!