The Tech 2 bots are very varied and, despite all being T2 bots, cannot be considered to consitute a true "unit type".
Like the Seraphim Ilshavoh, the UEF Gatling Bot is one of the most widely used T2 assault bots, simply because of its relatively cheap costs and its devastating firepower for a T2 unit. It also has a very decent range, outranging Seige Assault Bots.
A rocket bot, it uses a weapon similar to the Corsair T2 fighter/bomber. It's useful for destroying armored units. Lacks armor but has even longer range than the Mongoose, making it a good micro unit.
A walking bomb. It takes a long time to construct considering it has poor armor and only one suicidal weapon. Despite this, it is a powerful and useful unit. Useful for sniping ACUs that aren't being microed or watched.
The only T2 Assault Bot. Like the UEF Gatling Bot, the Ilshavoh is so widely used and effective for a T2 unit that most people think that 'A Seraphim player who doesn't have Ilshavohs is a player that's probably losing.' Is similar in stats to the Aeon Obsidian, but has a higher rate of fire. Good for mowing down T1 and T2 units. Can be used to T3 to compensate for the Seraphim's lack of a direct fire T3 bot.