My LMIII never really got on with my Stingray - it was good with my passive basses, but the actives, for the sounds I'm after, not so much. I had a Sansamp in front of it, but found I never turned it off, so sold them both and got a RH450, which I liked. I bought, played/gigged and subsequently sold several 'real' valve hybrids (LM Rocker, Ashdown Spyder, Mesa M-Pulse, Mesa Walkabout) which, while OK, never really did it for me, and I've ended up with a Streamliner, which is the best of the lot. YMMV, etc, etc, yadda, yadda.
The feature set on the RH450 (if, as has been stated, you have the footswitch) is still the best out there, period.