I bought both the SS5 and the JJ5 from their batch of demos (Oct 05). They both had faulty preamps (scratchy blend pot) but Darrell was very responsive and rushed replacements out for both. One of the newer preamps has the same problem just not as drastic.
While I meant to get reviews up for both I ended up tweaking the JJ5 for the first couple months (It had to have felt violated

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Here's my experience. Hopefully this will suffice for a cheap review as well:
The JJ5 pickups are slightly thinner sounding than your typical vintage jazz pup – but the real problem is they are not potted properly and once I brought it to a band environment, whenever I went up close to my amp to tweak it sent my amp into a high end feedback frenzy. I have since swapped out the pups for Fender Noiseless 5’s. Some claim they sound bland, but to me that’s the beauty of them; a nicely balanced vintage jazz signal, w/no hum, not too hot, to send on to a pre and/or amp.
Note - A slight mod was required to install:
The TBC pickup pairs are the same size. To install the Fenders, the neck pup cavity needed a very slight dremel grind to the cavity ears for proper fitting. The bridge pup needed the cover from the TBC neck pup to fit the cavity and I also had to drill out the pole piece holes on the cover (B,E,D,and G strings) just slightly to match the Fender pole pieces.
I then tried an Aguilar OB-1 w/passive tone and a Bartolini NTMB after I swapped out the pups but to my surprise, I liked the TBC pre better and have had it back in for the past 2-3 months. The TBC is not as Hi-Fi but I like it, it seems less colored than the other two and sounds very naturally balanced in this bass. Once in a while I’ll cut the treble slightly, or boost the bass slightly, but 90% of the time its set flat. I personally don’t see the great need for a passive active switch on these. I have never run a battery down while playing (assuming their switch will allow continuity) and these basses happen to sound passive when set flat anyway, which I like.
I have to mention that the necks on the TBC’s are where these basses really shine, IMO the necks alone are worth the money. They are extremely comfortable. They are 34 inch scale and the B‘s are clear (all the way up the neck) and taught on both of mine.
The SS5 soapbar pups are OK, compared to the JJ’s they are somewhat beefier, less aggressive with subdued high end. I haven’t taken the soaps out to see if they are potted or epoxied in their covers but I don’t have the same problem w/feedback. They look to be the same pups that might come in a Dean or Galveston bass? Scary! But, honestly the bass stock sounds better than I expected, hence buying the JJ5 shortly after. Although now, my modded JJ5 sounds better than the SS5. I haven’t done anything w/the SS5 although it sports flats now. It sounded really good w/rounds, too. The bridge pup soloed is a nice tone not harsh at all. It’s a keeper as well – just love these necks!! Curiosity had me wondering about swapping the pups but the replacement options are limited as the TBC pup routing for the soaps are 4.5 x 1.5 inches. EMG 45’s will work but I don’t personally care for them, found them to be harsh in the past (Spector). Bart has some, but they’re ~$100 ea. I’m content just using it as my mellow 5 for now and it works.
FWIW- I’ve since sold a Lakland JO5 and a 55-01. The JO5 was OK sound wise but the neck was not nearly as easy to play as the TBC. The 55-01 weighed a ton and had a glassy high end frequency that seemed to span across the entire spectrum that couldn't be tweaked out w/o losing the normal high end. The TBC JJ5 is now my main bass. It sounds great, is perfectly balanced strapped and weighs ~7.5 lbs! Ahhhh!! It's not the end-all bass but 5 mos later I'm still digging it!
I’ll try to take a pic of the JJ5 mod and post it up here. I’m curious to hear anyone else with a JJ model as to whether they have had the same problem w/the stock pups.
HTH
Before and after pics added. Damn, I had to severely squash my after pic to get it up here. It's not nearly as clear as the original. Be sure to maximize the pic window.