Corvette or Sonnax servo

I have a corvette servo and a transgo kit on the way, but I was looking on http://finishlinetrans.com and I saw a "new" servo that sonnax makes, It comes with the servo pin and has added seals with 18% more surface area that a vette servo.. Check it out let me know what you guys think. Or if anyone has installed this already let me know how it went... One last thing whats the difference between a 4L60 and a 4L60e...

the "e" indicates electronic controlled. Aside from that, little is different, AFAIK. How much more expensive is the sonnax vs. the vette servo?

the "e" indicates electronic controlled. Aside from that, little is different, AFAIK. How much more expensive is the sonnax vs. the vette servo?

The Sonnax is $100 give or take