The problem with that review is not that it's "well written." It's that it's long on "marketing" like talking about the helpfulness of the manual and the fact that "Flea has bought 10!" while also somewhat short on actual gig stories, real information that gigging bassists find useful, and instead talks a lot about features like a "footswitch box" and "horn switch."
Plus the "For more information, click here, it's a great site" line reads like a commercial, not like a "I picked up this amp and it rocks!"
Actually Flea Has Bought 12......LOL
Sorry, couldn't resist!
Anyway, I agree with all the above: Essentially it is an ad IMO -- the point is whether it's a rule violation or not.
The fact that it's well written at least has some bearing, I think: If e.g. a 13 year old kid gets on line and writes along the lines of "Brand XYZ kick *ss! I just bought one! It comes with a poster of the worlds fastest bass player, Tony Triplet, and a pack of super fast picks. Click here to order one->", it's also an ad, but nobody would get upset, right?
I don't mean to split hairs, I'm just curious about this. Perhaps a moderator could chime in, and clarify the matter.