Congrats! It's a fine amp, and one that should serve you well for a very long time. As the tubes burn in you will get more out of it of course, and like Bart I've got my box of popcorn! I have a C2500 & MC275 combination and an EVO 400 integrated in a different system, so I can't provide an opinion on sonics, but definitely enjoy both immensely with a minimum of worry given the circuitry and fail-safes in both amps.
The Prima Luna gives you more flexibility for tube rolling (vs. McIntosh only recommending KT88s), and the Ultralinear/Triode switch adds to the ability to explore and fine tune what you like (I have a set of KT150s I'll roll at some point later this year). The Mc C2500/MC275 combination does have a bit more flexibility with the C2500's connectivity options (even ignoring it's built-in DAC) and some more advanced usage features such as auto shut off and the remote having on/off functionality.
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Sources: Vinyl: Clearaudio Innovation Wood turntable with 9" Universal tonearm, Da Vinci V2 cartridge, Stillpoints SS & Stillpoints clamp, McIntosh MVP 901, Apple Mac mini via Benchmark DAC 1, Aurender N100C via Schiit Yggdrasil
Control: McIntosh C1100, Mcintosh MX151
Power: Mcintosh MC2301s (front), McIntosh MC501 (center), Mcintosh MC402 (rear)
Speakers: Sonus Faber Amati Futura (front and back), SF Vox center
Power/connections: PS Audio Power Port receptacles, RGPC 400 pro (2) WireWorld interconnects and speaker cable
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