This may feel abbreviated because I wrote a really long and verbose review of this toy the other night, but my website ate it, and I don't have it in me to write about this toy and its bullshit twice. So.
Let's just get this part out of the way: Power of the Primes Jazz's deco artist hid the acronym "MAGA" in super-tiny Cybertronian-language characters on both of his doors, and then whichever Hasbro employee was in charge of this freelance person didn't catch it, but one of us nerds spotted it and translated it, and everyone was all "whoa yikes" and Hasbro had to release a public statement because some jag tampographed a white nationalist slogan on their black guy Transformer character.
I removed it from mine with denatured alcohol after I took the photos you see here for TFwiki.
Before this discovery, this toy to me was kind of boring. And once I woke up last week to this news, it was suddenly the wrong kind of interesting.
Let's face it, this toy had a lot to live up to. The last toy of G1 Jazz was the 2010 Reveal the Shield toy, and that is one of those rare Perfect Transformers. And after seven years of budget shrinkage and rising production costs, it is impossible to create something that perfect again at the same pricepoint -- and even if you did, it'd just be the RTS toy again.
I mean, this isn't a terrible Jazz. It's an aggressively okay Jazz. It's just not a perfect Jazz. But the one thing it has going for it is that it can become an arm or a leg for a combiner. It's true, RTS Jazz couldn't do that. And it's not a small thing for a toy to do. (Admittedly, another thing that RTS Jazz can't do is be on shelves right now in 2017, so that's another point to PotP Jazz.)
Like the other Deluxe Class toys from this toyline, Jazz's combiner fist is also chest armor for the robot mode. However, it fits on his chest only awkwardly, if I'm following the very scant instructions right. There's just a drawing of the fist/armor piece and Jazz with an arrow, the end. I thiiiiink you're supposed to gently nudge those thumb tabs into the seemingly-corresponding slots on his fender. But it's not a great, secure fit.
In summary: This is the best available Jazz to you currently, but it's definitely not the best Jazz possible. But it can be a combiner limb, if that's cool. Also, maybe you might want to wait until he's repacked for Wave 3, since the MAGA might be gone by then, or see what the hell TakaraTomy does with him.