Yeah, resale isn't good - unless you want to buy one. Then resale is great!
I disagree a little on the 'surpassed comment. Certainly in terms of power (forgetting about the APM for a minute), there are many, many class D amps out there that have a LOT more horsepower.
But in terms of tone - there isn't an amp that sounds lkie it. So if that sound is your thing - then it hasn't been surpassed.
BUT
I do believe that the rh450 and rh750 have been surpassed technologically by their own company - TC.
TC have developed one knob pedals that are more flexible (via software) than these amps. Despite being at the cutting edge in 2009 in terms of presets - these amps (whether you love the tone or not) are no longer anywhere near the edge technologically - and that is by TC's own standards.
Yip - in the amp world 3 presets is still pretty cool - but compared to the digital pedal/preamp world - is very limited. These amps are digital.
How many flavours of awesome can I download to the (very cheap and tiny) spectracomp pedal on the fly? Numerous. By comparison - I can only have 3 different versions of the same tubey, compressed rh450 tone on my amp. (I love this tone BTW)
I would love TC to just go crazy integrating the same sort of editing software into their bass amp line. Imagine completely different sounding preamp models, power amp models - all able to be downloaded to the amp and tweaked on the fly (like a regular amp), but then deep and full editing software as well.
Bass amp 3.0
It would be great if there were some way to incorporate the Tone Print feature in to the RH heads. That would be a best of both worlds situation because I love the tone of my RH450 but having the features that are in my BH550 would be great too! I was briefly excited to see that TC recently came out with a Tone Print Editor software. That excitement faded when I realized it worked only with Tone Print enabled pedals but not the BH series heads? Why TC, Why? It would have been awesome to be able to tweak Tone Prints, save them and upload them to my BH550! I really don't see why TC couldn't make that possible.
. Normally she doesn't notice that kind of stuff, but this time she did and liked it. I'll be trying it this weekend and see how it sounds with the band, if I don't like it, it's back to memory one which is my usual tone. BTW I could not get an exact match on the TC with the Youtube videos of the Darkglass, but it got pretty close and did it's own thing very well. I'll post back later this week after I see how it sounds with the band. Playing it decently loud though with some Rose Tattoo, UFO and Van Halen sounded pretty good though.