ok downloading it and copying first, if you really like it then you should buy the disc's. This is what i did with the dvd's I have had bought. Region yeah can differ i tend to get region 2. size is 16:9 seems fine to me, 625min is arround 25/27eps... I think its due to the HQ DVD setting they used 2 dvd's (normal) or maximal 3 because if you read the bonus content you can see that there are full eps voiced over. Useally these can be added to the Language list so you can switch to commentary but they might have added different footage etc. (that's why i expect its on the 3rd dvd and the bonus content like art work ost are on the 4th.)
but still its quite cheap.