I too have done somehting similar. I got a beer machine for Christmas and have been "experimenting" with method and ingredients. I have tried the "Beer Mixes" that came included with the kit, used it as perscribed and made an evaluation;
Beer was not awful, but lacked depth, character and full flavor. I knew whay this was and decided to try it a different way.
Next mix I treated differently with time. Instead of 5 in primary, I let it go a full seven days. I racked it to another container (a Mr. Beer fermenter) and let it clarify for nearly two weeks. Bottles that whole batch with corn sugar and it's been sitting for a week so far. Hindsight shows that I should have taken advantage of he CO2 build up that happened during primary and stuck it into the fridge for some natural carbing. Nonetheless, I opened one bottle last night and was astounded by the clarity from the secondary transfer and the carb from dextrose. SO overall, the results look promising.
Now, last week I bought a kit from the LHBS for a sweet stout with grains for a "mini-mash" recipe. The guy up there in the shop was cool to "customize" the kit to a half batch measure. Went home, did a boil etc etc, just like the directions for a full batch would have been for any other kit or system. Then, chilled, aerated and pitched a full vial of WL ale yeast. It finished primary in about 6 days and I now have it in the fridge absorbing the CO2 so that I can have some natural carb. I tasted a 4oz sample last night and it also is right on the money! Color, etc etc. I will wait it out for a few days, rack to a secondary for clarification then bottle at two weeks. All in all, it's a cool little keg system with a pressure gauge and force carbing unit if you don't want to brew 5 gallons every time.
No one said that you had to use it the way the Beer Machine people say, and since I have recieved it as a gift, I may as well make it work for the money my wife paid for it until I see fit to move on. Good for you!!