Although, as well as

Although this computer is easy to use, it is slow.
Although = advantage + disadvantage

As well as being compact, this computer has a large memory.
As well as = advantage + advantage

As well as having a poor keyboard, this computer is unreliable.
As well as = disadvantage + disadvantage

Decide if these sentences are correct or incorrect:

1) Although the computer has a large memory, it is easy to use.

2) Although the computer is cheap, it is unreliable.

3) As well as not having many programs, it is slow.

4) As well as being cheap, the computer is easy to use.

5) Although it is easy to use, it is compact.

6) As well as having a poor keyboard, it is easy to use.