M302 Mira, the first Proxima Centauri 042A rebuilt from a Starsystem, has entered service following extended new type proving trials. All 8 Starsystems and the Isometric-Prototype will be rebuilt and upgraded to the new type which is fully capable with worm drive, Z7 and TPM-2. Indeed a NS source says converting a Starsystem gives "90% of a Corkscrew for 60% of the price" and the programme is seen as a lower-cost way to boost the size of the Medium Combat Ship fleet.
The main disadvantage of the Proxima Centauri over a Corkscrew 051A is in operational flexibility and the ability to work with small craft and UCVs because of the small size of the legacy docking bay. The Proxima Centauris will likely be allocated patrol circuits where this lack of capacity will be less of an issue, such as along the Remedian/Utrek border.
