I used an Eden (WT400, then WT550) for 6-7 years, and the transition to the RH450 was painless. Though I had to play with the EQ quite a bit to find the tones I wanted...
The TC's range of EQ is greater than the other amps mentioned here, but, as mentioned, it is missing some of the sizzle modern players would want. There is nothing missing in the mids or lows however! Particularly if you are looking for a more vintage, even tube-like tone, and even more importantly, tube "feel." The louder you play, the more evident that "tube-ness" becomes, whether you use the compressor or tube-tone or not.
And though "watts are watts," I've always thought tube amps had a gutsier sound than equally powered (even 2-3x the power) SS amps. But not so with the RH450. It truly feels like the gutsier tube heads I've had (Ampeg, Fender Sunn, Traynor). So much so that I have sold all my tube bass amps! Now I'll never have to re-tube and re-bias another tube head for bass again! There's something comforting about that too (IMO).
I recently recorded a bassist using a GB Shuttle 6.0 through my 2x12 sealed cab (think Ampeg's SVT 2x10AV). I'm quite familiar with the cab, and thought the GB presented itself quite well. But must agree that the bass frequencies were a little anemic...
I found the Edens mentioned to be "plug n play," while the TC needed a little coaxing. Having messed with the EQ (including making "major" changes to the low and low-mid center freqs), it is an amazing amp! Other than the sizzle, I can't find anything missing from the RH450!
As an experiment, I lined up all 3 of my 15" cabs (Carvin 115, TL606 and TL606"D") for 4 15" speakers, powering two 15s with the TC, and the other two 15s with a Carvin PA amp. That was certainly mind blowing! But I can't see ever needing to do this on a stage. Ultimately, the TC made a great pre for such an occasion where the PA carries the big power.
I heard several bassists a couple of nights ago through my RH450 and a KappaLite 3015 loaded '82 Carvin 1x15 cab (with second port added). Two of them were 5 stringers, and both used a brighter tone than I do. They missed the hi freq horn, but were otherwise happy with the sound. It sounded great throughout the club we were in...
I think you'll be quite happy with one!