Electronic attack ships are mobile, resilient electronic warfare platforms. Although well suited to a variety of situations, they really come into their own in skirmish and fleet encounters, particularly against larger ships. For anyone wanting to decentralize their fleet's electronic countermeasure capabilities and make them immeasurably harder to counter, few things will serve better than a squadron or two of these little vessels.
Viziam ships are quite possibly the most durable ships money can buy. Their armor is second to none and that, combined with superior shields, makes them hard nuts to crack. Of course this does mean they are rather slow and possess somewhat more limited weapons and electronics options.