We don't have any "pros" on this thread. We do have, however, a considerable number of very experienced amateurs (this includes me). Between us, we've sampled the vast majority of RY4s and RY4-variants in the marketplace, and---as a group---we are quite knowledgeable about RYs. Passerbyeus is certainly a member-in-good-standing of that group; Jim Bob is, too. I don't know how big the group is, but I'd think at least 20-30 posters, either regular or occasional.
Are we to be trusted in our perceptions, opinions, and judgments about RY4s? Of course not. Not because we are liars or idiots, but because juice reactions are always subjective and all over the map, from love to hate. The best, most delicious juice ever made (if such a thing could exist) would be lucky to get more than a 50% approval rating from vapers who try it. So, if anyone says, "I loved such-and-such RY4, and I'm sure you will too!," ignore the hype. Maybe you will, maybe you won't. It's a roll of the dice.
Way back when (1970s? 80s?), Sara Lee (the bakery company) had an ad campaign for their frozen baked goods and desserts hawked in grocery stores with the tag line/jingle: "Nobody doesn't like Sara Lee!" Well, that's advertising for you. (Truth is the first casualty of War and Advertising...) The slogan was not true then, it's not true now, and it will sure as hell never be true in the realm of e-liquids (or vaping hardware, either).
Be that as it may, most posters on this thread (whether they qualify for the group of expert-amateurs or not) are quite willing to share their perceptions and opinions, which is as it should be. We're here on ECF to kick the can around the playground and have a good time doing so.