Just to clear up a couple of points: NO, there are no legitimate Harris PRC-152 surplus radios on the market, not in the US, not unless they're stolen US government property. The PRC-152 is a Type 1 encrypted product and is NOT legal for civilians to own. It MAY be possible that such radios could be found on the black market in certain foreign countries. In which case they're either battlefield pickups or were "liberated" from allied forces (Such as the Iraqi Army that we have equipped with these radios) and in either event you can't legally touch them, not in the US.
There is at lest one SIMILAR Harris radio that is basically the PRC-152 with non-Type 1 encryption packages, which ARE legal for civilians to own, if you can stomach the roughly 15,000 dollar price tag. That is the RF-310M-HH. Harris makes other radios in a similar form factor such as the VHF only version RF-7800V-HH.
I had an earlier version of the Triumph PRC-152 for a while. It was OK. The receiver audio was tinny and the speaker is Chicom garbage. I was able to improve on it by some CNC machining to the front audio board and some mods to the front housing that allowed it to accept the speaker from an XTS5000. It was still tinny but that did improve the audio considerably. I'd recommend internally adding a small power amplifier chip and adding some equalization filtering to knock down the raspy treble.
What does the real Harris 152 offer over the TRI replica? Start with 30 MHz to 870 MHz frequency coverage, not including the 450-762 MHz range. Yes, 800 MHz P25 trunking is an available option. It's a voice/data radio and incorporates ad-hoc networking. It does a LOT that the TRI radio doesn't even try to duplicate.
Here's the spec sheet.
