Pretty decent. Don't forget the starfire missiles on the exarch and rest of the unit and the ammo catch and void shields for the bunker. It is a bit of a points sink but it does well against most enemies.
BTW you fire the starfires are non skimmer/flyer/FMC targets and let the lascannon snap fire itself at a different target. Most lists now have a flyer, skimmer, or FMC in them so it is rare to need to snap fire the lascannon. This setup is actually best at intercepting flyers and concentrating on skimmers and FMC most of the time so you don't waste your reaper squad.
Also don't forget the reapers can jump out of the building and move and shoot at full BS. This is helpful when something with a template or a lot of grenades gets close to the building. Also the building gives units behind it a 3+ cover save. This is extremely nasty on a waveserpent or two especially with holofields.
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