As a recent purchaser of the MB58R 102 pure pictured above in the thread, I can tell you, you do not need the tilt back. The rear port is pretty “omni” sounding. Very easy to hear yourself.About 8.5 lbs for starters. The CMD102PV can be tilted back into monitor mode and it is front ported.
The 58R probably has the new "HIFI" tweeter. They both have the same 58R 500 watt LittleMark amp. Just two variations on a 2x10 combo. If weight is an issue, I'd go MB58R Pure combo. If you'd benefit from the tilt back option then the CMD102PV is your baby. It has been around for a while and is favored by many.