Since the high grade hydra implants were released, it seems to make the Gila viable in T5 dark sites. Due to the reduced range + speed boost in dark sites, the drones of the gila have a very hard time hitting.
Hydra implants increase drone range as well as missile range (which the Gila uses). Using these implants allows you to speed tank like a boss in the crazy speeds of dark sites as well as apply decent dps. Heres a vid I made explaining how it works and also some testing