Ehhh... I'm not convinced with these replies. The Vigilance isn't desireable as a support ship in the Campaign, but in my opinion the shields, speed and agility are not the reason. It's supposed to be a fire support vessel to escort larger ships; cruisers or capitals, but even then it has issues I think should be solved.
These are the main issues I think the Vigilance has that need to be re-balanced, and why:
1) Maintenance Cost: This thing is as resource intensive as a Wolf, for arguably a much simpler hull and smaller crew complement. Yes, it's got two medium mounts, but I always think the big reason the Wolf's supply usage is as high as it is is due to the Phase Skimmer, which must be tough to maintain - the phase ships certainly are. Personally I'd drop the Vigilance's monthly supply usage down to 4 - on a par with the Lasher and the Cerberus.
2) Deployment cost in combat: For similar reasons as above. It's a support ship - why is it so expensive to deploy in combat? I found myself preferring a Hound armed with a front shield, Heavy Machine Gun and Vulcan cannon in the campaign because it only costs 3 DP.
3) Hull integrity: The Vigilance only has 1000 hull points. Why? It really needs more. Just because it's not a brawler doesn't mean it has to have a paper-thin hull. I'd bump this up to 1500, on a par with the Wolf (as the armour rating of 150 already is).
4) Peak combat performance duration: For the Vigilance, 240 seconds (4 minutes). Again, as a support ship which will ideally be assisting larger vessels, this should be bumped up as well. Had a look at Starsector's other "Support Frigate" the Monitor and noticed that it's peak performance time is 360 seconds (6 minutes)! I'd push up the Vigilance's to nearer this, maybe 300 seconds.
Also, just to clarify, I have zero gripes about the Vigilance regarding:
- Narrow shield arc
- Slow speed
- Flux handling
- Campaign cost
These all seem fair enough to me.