Warframe as a game is always changing and evolving. Two major examples that I have personally played through are the U22.12 weapon overhaul, and the U27.2 Warframe Revised update. Unfortunately for a sporadic content creator like myself, this means that my content is made redundant over time, and I don't have the time to update everything. As such, please take note of the version at the time of each review's latest update.
A new Unvaulting has just been announced. Chroma and Zephyr Primes will become available once more starting April 27th, replacing Banshee and Mirage Primes.
Pandero Prime is one of Octavia Prime's signature weapons, an MR14 Secondary. With very strong stats across the board, it is a solid, if fairly un-interesting, low-capacity hand cannon.