I've never used an OL DC motor kit. But I have used other OL products, and they are very good value and performance. I can also say that I have used AC synchronous motor TT's, and DC motor TT's. The DC motor, IMO is a significant improvement in performance. Especially with battery power. I would have every reason to expect that the OL DC motor upgrade would be a very good improvement to your Rega 3.
Next, is value for money spent. You have to consider if the final result is worth the significant investment in the DC upgrade. The upgrade is not cheap. You should look at other TT's you could purchase for the combined price of your table plus the upgrades, to see if you can do better that way. Ultimately the bearing is the key to your TT performance, and motor upgrades, while nice, will not take you as high as bearing/platter upgrades.
My general opinion is that you should not make motor upgrades until you are satisfied that you cannot improve any further in the bearing/platter/base department. Then, and only then, are you going to reap the full benefits of your improved motor system.
Next, is value for money spent. You have to consider if the final result is worth the significant investment in the DC upgrade. The upgrade is not cheap. You should look at other TT's you could purchase for the combined price of your table plus the upgrades, to see if you can do better that way. Ultimately the bearing is the key to your TT performance, and motor upgrades, while nice, will not take you as high as bearing/platter upgrades.
My general opinion is that you should not make motor upgrades until you are satisfied that you cannot improve any further in the bearing/platter/base department. Then, and only then, are you going to reap the full benefits of your improved motor system.