All I can do is re-inforce what everyone else has said. You will not get high end 'sizzle' or that ultra hi-fi slap tone from the RH450, but for everything else it excels. I love my RH450, and use the Classic as a power amp to give even more 'controlled' power (i.e. I don't have to turn either amp up as much when linked to get the gig volume I like). I have kept my two Markbass amps as these can do what the RH450 doesn't, but I must say they stay at home - but I know if I ever got rid of them I would want to use them again!!!!
The other great thing about the RH450 is having three pre-sets. I initially thought this would be good to switch sounds or for switching basses, but the fact is I rarely do this at gigs. How this works for me is that I have found three eq settings that work with my 'go to' bass in different types of venue: Larger Venue; Small/Medium Venue; Venue with very 'boomy' sound charateristics (e.g. large wooden stage). This has made set up for me very easy and consistent.
As Beedster says, use your ears. If you like the sound buy one, if not look elsewhere.