The 1500 is not a bad motor, it's thrust washer problem is more owner inflicted than anyhting else, and can be corrected by not sitting at stop signs and red lights with the clutch depressed, as the MG engine don't need this treatment either as thier carbon T/O bearing wear quickly doing this.
The 1500, I bult quite a few of them, are harder to find performance parts for, campared to the 1275 for example, but then so are alomost any other LBC engine when compared to the 1275.
I think the 1500 RB Midgets are going through a breath of fresh air in the hobby. many people in this hobby for a long time, have always gravitated to the Bugeye or A-seried CB Spridgets, for us long timers it the coveted choice, howevermany new folks are coming inot the hobby, that could care less about CB vs RB, 1275 vs 1500 Triumph motor, they have just found themselves a cool liitel car and want to have fun with it. So I think the 1500 Midget is going through a new evolution in it's life, and it will increase as new, and younger folks get into the hobby. It will real easy for us long term Spridget hobbist to simply tell this folks, go get a CB A-series engine, but it alot deeper than that, the CB Midget deserves it time in the limelight as well as the rarest of Bugeyes, and thes folks whn scorned about thier choice in LBC will simply turn away when we give them purist advice, not that none of you in this post have done this, but it happens alot in the Spridget community. Time to give the RB 1500 the same attention and devotion as we have given to the A-series engine cars. The 1500 Midgets can be great cars, and will in the future and even now are being restored, hot rodded, and will be contiuned to do so. All in all, that's a great thing, just more folks enjoying the LBC expereince.