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They also get a great weapon selection of 2 special weapons per 5 scourges. So a squad of 10 can easily support 4 Heat Lances, Blasters, or a host of other weapon options. This means they really are a heavy mobile fire support platform.
We are allowed to upgrade one to a solarite, who can grab a blast pistol and some close combat type weapons. The Blast Pistol added to a unit of 10 scourges with 4 blasters, gives you 5 men with str8 lance weapons that can move 12" and fire, giving you a 30" threat range with the Blasters (not the pistol).
Being able to deepstrike, 4 heat lances will really come into play. However, I get a good feeling about having 4 blasters and blast pistol in a 10 man squad. There are other exotic options as well, including the Haywire Blaster which fires haywire grenades. Thinking deep (5 minute pause in writing), I was just imagining 4 splinter cannons (that's 24 poison shots if they don't move).
As you can see there are many ways to field scourges and I think they are very adaptable, and will find their way into many of our lists. They give the new reavers a hard running for the fast attack slot.