The muscle quality depends on a number of factors, including the substance in question, the dosage and duration of use, the frequency of heavy weight training, and proper diet and supplementation. The factor most responsible for "muscle quality" is the person doing the training. It stands to reason that longer cycles will result in more gains, if you follow the correct protocol.
Well, of course. SD is a strong methyl, whereas substances like Test are typically injectable since their bioavailability through oral use is low. Since SD and Ergomax/Phera Plex are methylated, they are harder on your liver than injectables. However, they are legal. You would not generally use DBol, a methylated oral steroid, for 8-10 weeks. In an AAS cycle, DBol is typically used to help bulking at the beginning (Weeks 1-4) of a cycle, before the injectables have taken full effect. SD or Ergomax could conceivably be used in a similar manner but are, as with DBol, useful alone.
SD is a methylated form of the steroid Masteron and is also chemically similar to Anadrol, so yes, it works much like "real gear" as it is "real gear". Ergomax/Pheraplex appear to be forms of the designer steroid DMT, also "real gear". Search ths board or BB.com and see the SD or Ergomax solo logs of 10-20 lbs of lean mass gains in 4 weeks of use. Of course adding in injectable Test or Tren (or both) will increase results. There just is less of a difference now between what is legally available (for the moment) and what is a DEA Schedule III substance.
I don't think it's a case of "easy" but gear is going to make someone with everything else in order able to achieve genetic potential much quicker. Some people need to work harder at it than others. SD does what it claims. So does Ergomax.