opinions please: CJ PV12L w/ a BAT VK200?

No negative effects Im aware of.Just a little work to get it setup correctly and small amounts of money to build it,YMMV,Bob

Negative effects? Well, let's just say that staying balanced has it's advantages.

I am not sure of the differences between the PV10b and the PV12L but I didn't like the 10B with my VK200. It was too dark and laid back for my tastes. If the 12 is more transparent then it would be a decent fit but of course this is my 2 cents. My speakers are Tyler Acoustics so I am not sure how they match up with the Maggies.

Update and thank you.
I was getting a bad vibe from the seller of the BAT. I did however find a CJ MF2100 here on GON. So I think the pair should do well. From what I understand the trio should work well. Now on to cables and source (till I go through this all again). Any additional comments are mst welcome.
thanks again

LOL...I have had lots of bad vibes from sellers here but life marches on :)

The MF series should be a good match. I would tend to get some cables that are relatively neutral sounding. Not sure of your budget?