Long-time lurker, first-time poster, so I'll try to make it count.
This seemed like a good thread for some field notes on the subject of monster cocks (or pseudo-monster cocks):
Europe
Antoine-Mallet (PlanetRomeo): An interesting curio for fans of his 1990s Cadinot films. Definitely older than the 33 years advertised (do the math), but well preserved. Huge uncut dick. He gets hard, but I found him to be selfish in bed, rather than focused on the client's likes. Very chatty but not very bright.
Mikehorny (RM) / TrosGrosZob23 (PlanetRomeo): A great find. Handsome, natural middle-aged guy, buff but not 'roided out. Truly massive dick, with a very thick shaft and a huge uncut head, plus enormous balls to match. Good in bed, would hire again.
RussianXXXL (RM): Looks like his pictures, but disengaged and mechanical. Not XXXL or 9 inches as advertised (his recently uploaded video makes that clear).
donkeyboyldn (PlanetRomeo): Fun middle-aged guy, good in bed. Slim body. Has a full beard, which was a bit of a surprise since he doesn't send face pics. Dick is big but not quite monster size. Some of his dick pics are probably photoshopped.
BigBritishMeat (RM): Some will remember his amateur videos as "SkinnyThick". Sweet guy, a bit mechanical in bed but delivers the goods. Another "big but not quite monster" dick, although the pics are accurate.
XXXXXXL_de_Romeo (PlanetRomeo): Horrible. Drawn-on eyebrows and seems to wear some kind of hairpiece. Dick nowhere near the 23 x 9cm advertised. I asked him to leave.
USA
CutlerX (RM): The Gold Standard. Fun, sensual, rock hard, delivers a whole hour. Huge uncut dick. Did things to me I'd never experienced (and I've been around). Can't wait to hire again.
Ian McXXL (RM): A solid escort. More XL than XXL, but he's good in bed and goes for a full hour.
KingMidasXXL (RM): Couldn't get hard at all. Lots of restrictions (no kissing, no touching his balls, will only get sucked a certain way, and so on). Seems to think his personality is a draw. I left quite frustrated.
EstebanXXXXL (RM): His dick is deservedly legendary and does get fully hard, but I found him to yield diminishing returns. First hire was great, second was somewhat rushed, third was a disengaged and perfunctory 15 minutes. There won't be a fourth.