mjon99:
The woofers just use your basic spring posts, no soldering required. Haven't seen the 15" woofer, but I'm pretty sure it'd be the same, take a look at some pics at PE's website.
Yep, it really is that easy...you'll need a knife some glue or spray adhesive and some screwdrivers and wrenches...way too easy.

I look at it like building computers...I know a million guys that have assembled some or all of their own personal computers with the same parts they'd get from Dell or whoever, but saved a bundle...same thing with DIY speakers and subs.

And building mains isn't nearly as hard as you'd think if you can solder...buy a soldering iron and practice soldering paper clips or finishing nails and in a few hours you'll be more than ready to assemble any kit with pre-fab enclosures. If you can build your own, even better...it's way more work, but far more rewarding.

I'm in the middle of replacing my Paradigm Studio 40's and 20's with none other than the audioreview.com DIY kit by Ed Frias. These are the 2nd speaker design I've built myself, and the 3rd project I've completed (first was a vifa/scan-speak tower combo I had much help with).
The ar.com DIY's are just better at everything than the 20's and have almost as much bass as the 40's, but the bass is more accurate and tight, IMO...the soundstage is much wider, deeper and the imaging is equal if not better...The midrange and high end detail is where the DIY's really move ahead of the Studio's, I really can't think of a commercial speaker under $1200 I like better than these...sure I'm biased now, but it took alot of nerve for me to replace $900 and $1200 speakers with $250 worth of parts.

Warning, the DIY think is dreadfully addictive...I'm on my 3rd speaker project, and about to start my 2nd sub project. I don't think I've really "saved" any money, just learned a lot, picked up a relaxing, enjoyable hobby, and achieved much superior sound.

DIY is a great way to get the most for the least, but keep in mind I haven't designed any of these (that's next after the 15")...designing from scratch, the trial and error etc, would consume a bit more time...the DIY community is great and there's tons of info available though.

Good luck.