You're correct. The original Yamaha TRB's and TRB-II basses are of excellent quality. I've also owned a few of those both on models. The thing to remember about those models is the fact that they we're made in Japan just like the P and Pii series basses. So the standard of production were very high.
However, even though the quality of the 1004 and 1005 are very good, they really don't compare to the Japanese made models. The production standards just aren't the same. Regardless, they would make for a fine instrument in their price range.
+100, I compared the TRB5/TRB5II to a Music Man or MIA Fender and the TRB1005 to a MIM Fender. I don't thnk that is an insult. A MIM Fender is a perfectly playable instrument, I know I have owned a few myself, and was very happy to use them. I just think the MIJ Yamahas are a big step up in quality. The current TRB5PII is a boutique level instrument, IMHO. The main point is that one simply must know what one is buying, and accept it for what it is.