Hi Karamel
I have a multi piece but it loads from the top like this one: http://www.platinumstages.com/UK-Special-Multi-Piece-wcase-_p_286.html
I like it (even though it was a bit slippery the last few days) someone else can tell you more about the extreme pole but I've read that if you phone the company they can be convinced to send a top loading pole like mine if you prefer.
The good points are that it is sturdy, it switches easily from static to spin and it's removable.
Not so good: problems with the threading getting stuck so it would be hard to screw together and unscrew. Luckily I bought mine through my pole studio and my teacher helped me and got me new pieces that screwed together properly so I didn't have to deal with their customer service which I've read is sometimes not so friendly.
Also I don't know how the bottom loading poles effect slides and spins but the sections that are attached in the middle of the pole are not a problem. There is no ridge that sticks out so you can move up and down smoothly.