I had a pair of SE84UFO3 with all the mods for over four years, and now have had the SEWE300B for over two years.

I'm posting just to say that the SEWE300B is more/different than the UFO25 sound with more watts. To my ears the UFO25 sound is more analytical, and the SEWE300B a fuller, deeper sound. That's the best way to describe it. I've lived happily with both, and both allowed me to tailor the system to fantastic playback. But there's more to it than just power number difference. (I've had a fully modded CSP3 in use with both--the differences in texture and depth are even more pronounced when the SEWE300B is used with the preamp, but I found that better sound came without a preamp as the SEWE300B has an amazing "preamp" stage built in).