Datasucker is good. If you are Freedom Khumalo, it is very good. And if you use Aumakua, it is amazing.
The goods points of Datasucker is : it build up fairly quickly, it is super cheap and it is always useful. The only disadvantages are : it is a virus, thus prone to purge, and it take 1 MU.
It pair really well with the following.
Freedom Khumalo, to use the ID ability to trash anything.
MKUltra and Black Orchestra, because they are expensive to push the strenght (not, this apply for any inefficient breaker).
Musaazi and Yusuf, to have more virus counters to use them.
Acacia, since it accumulate token easily and fast, a purge will net you a lot of creds.
Aumakua, which allow you to use it earlier on an ice, by lowering the strength of the ice and breaking it with Aumakua. This make breaking ANY ice cheap. Best of all, if you have 2 or 3 Datasucker, you get token so fast, you will be able to break most ice after one successful run and any ice after two successful runs (on centrals).
At one influence, it can be splashed anywhere. At its base, it make boosting the strenght of a breaker free, you just pay for breaking the subs. Always useful, if youhave the MU for it.
Now, all it need is a quote to make this nice card even better.