Audio-Technica AT-ART9 phono cartridge

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I've looked at that Bob's Devices product at the Newport show over the past few years.  I've been tempted. I have a very good phono stage (ARC PH-8). I was wondering if I could make an improvement by adding the Bob's Devices unit to the system that would justify the price.  The ART-9, at .05 output works perfectly in the system. What improvement could I expect with adding the Bob's Device, if any? Any ideas?

ARC makes such nice gear.  I'm not familiar with the PH-8 but I've seen where ARC sometimes goes hybrid or used an internal SUT for moving coil but that's just from memory.  My B2B-1 is FET and it is very quiet even with the extra stage for MC.  Having said that the SUT results in even quieter operation.  I haven't made any measurements beyond cranking the line stage up and listening for hiss and power supply harmonics.  The SUT seems to bring something special to the party.  I hear no roll-off in either frequency extreme.  The B2B-1 designer suggested that it might be a little less dynamic with an SUT in place.  He's a great deal more experienced than I am but I can't hear that with my particular setup.  The sound of the SUT is just a little different.  Bob's Devices gives you 14 days to listen risk free.  His confidence is justified.  I never looked back.  To be fair, these are fairly recent purchases and I need to go back and listen the B2B-1 in MC mode without the SUT.  Will do that soon since I have a second TT now.  My old Aragon 28k has a great phono section but I can't get the hum out in MC mode.  MM is just fine so it works great with the SUT.  I'm going to run one TT straight to the B2B-1 in MC mode and the other through the SUT into the 28k.  I'll update after I've had a little listening time.  I'd certainly do business with either Bob's Devices or LibertyAudio again.  Great companies!

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Thanks for the response, aragon ...

I've spoken to "Bob" a few times at the Newport show. Nice guy and a real enthusiast too. 

I had a slight hum in my vinyl rig too. I solved the problem by attaching a ground wire to a screw on the outboard motor of my Well Tempered TT and then just letting it hang loose behind the equipment rack. I have zero hum now. Funny how a little fix like that can make such a difference. 

OP

Yeah, when you have so much gain and so many sources of mains noise it gets interesting.  My 28k is quiet in MM mode but I get mains hum in MC mode.  The outboard power supply is plus/minus 24V.  I used 4 lead-acid batteries for power with zero change.  Then I shorted the inputs with zero change.  That's when I ordered the SUT and the B2B-1.

I'm an EE and I have the parts here to build a choke filtered regulated supply but I just haven't had the time.  No project is as fun as audio.  Homebrew electronics!

Thanks again to all who offered opinions on the ART9.  I installed mine a few days ago and it's excellent.  I didn't know how it could improve upon the OC9ii but it did.  The mids are so nice.  Ordered from the highly regarded seller in HK on a Thursday and it was delivered the following Tuesday.  I never purchase items like this without researching online.  This thread made me confident to place this order.

Also, I spoke with ATUSA and they do indeed support the ART9 in the US.

Cheers all.