- Virus counters can be purged, so if you rely on it too heavily to be able to defeat ice, sometimes the Corp can shut you out with a timely purge
- Memory slots for non-breakers are sometimes scarce
- probably the most non-committal card in order to get some pressure on Archives
- useful to enable fixed-strength breakers - Yog.0, Mimic and Morning Star
- usually you get 1 credit worth of virus counter for a successful run on a central server, just that these "credits" can be removed by the corp
- so you should try to use them liberally
- they synergize nicely with Desperado and other cards that give bonuses for runs, because ultimately each server has a certain price tag, but it gets more and more expensive for the corp to increase the price while the value of multiple Datasuckers is linear.