First off I know that the shaker thing has been done to death but I could not find the answer I was looking for. What I was wonting to find out is if anyone could tell me if the pro shakers are that much better the the standard. I'm looking to put some in both my love seat & sofa. The love seat is not a big issue as it is mostly used by my boys & friends when they come over. But the sofa I wont a good reaction from. But heres the issue I wont to do it as cheap as possible so thats where I was thinking of the standard shakers. Seeing how PE has both of them for a awesome deal I could get 4 of the pros for a 100 bucks, or 6 of the standard for 90. What I was thinking is if I went with the pro I would do 2 or 3 in the sofa & whats left in the love seat. Or if I used the standard I could put 4 in the sofa & 2 in the love seat & be saving 10 bucks. What ever I do I will be running them with the PE 250watt plate amp. I have had no experience at all with the shakers so I don't know if this is just over kill or if it would be just what I'm looking for. I'm mainly just going by what I have seen done as far as how many per seat. Looking at the specs for either, the pro has more force at 30lb peak versus 20lb peak for the standard, witch I would assume has to do some with the more power handling of the pro. But everything else looks to be the same Fs: 40 & a frequency response of 20 to 100hz & both have a normal impedance of 4ohm. So dose anyone have experience with either or both of them that can clue me in on the better buy or the most shake for the buck. Thanks for any help.