I wasn't gonna chime in on this one due to my limited experience with 'em... but my review closely matches others I've read, so maybe it will help in some small way.
In the early '90's, I was in a band with my now ex-brother-in-law. He ran 2 - 1000 watt Hartke rigs in stereo. Each one consisting of a 2x15, 4x10, & 4x5 cabs. His primary weapon of choice, was 6 string Ibanez SR. His second was a MIM Jazz fretless. The Harke was perfect for his primary sound. Tons of clear, bright headroom for slapping & chord work, & lots of ultra low to appease the mighty "B" string. As you might expect... it wasn't so great at everything in between. I remember one time, shortly after he got the fretless, He wanted to try & get "a good vintage tone" for his new toy. He literally spent hours on it before giving up & deciding to use his go-to sound & using a different patch in his ART NightBass multi-fx unit instead. I forget the specific model of the heads, but you could select either tube or SS pre-amps. As expected... the tube-pre accomplished nothing good, in regards to "vintage tone". Still very scooped, with thin, gutless, "electric razor" distortion that couldn't cut it's way out of a paper sack. It was a modern amp, made to sound like modern amps, and not much else. Ya ever hang wunna those "Little Tree" air fresheners in your car & then fart? Kinda smells like ya s#!t in the forest, right? Well... same sorta thing with those Hartke amps. Putting effects (rack and floor) in the loop was like that. The fx were the "Little Tree", and the amps were the fart. I used to work in a music store that dealt Hartke. I've had hours & hours of involuntary exposure to them, with a wide variety of basses and players... and I just don't like 'em. They have a very "sterile", non-organic sound to them that I find quite disinteresting and uninspiring. There are obviously a great number of places where that sound would be right at home (again... really great for chord clarity)... but especially since getting a Thunderbird in my hands... I have no use for it. All that being said... That was early - mid '90's. Maybe they've improved, or issued newer models with different characteristics... but much of my review matches up with many reviews that are more recent. Only you can decide if a Hartke is right or wrong for you... but I would strongly urge you to try before you buy.