Trick Dominator vs Big Foot

[SlitYourDrums]

Before anyone says "Search", I did, and they did not provide me with the information I needed. Anyways, I'm looking at these, and I honestly cannot tell a difference between the two, except $250. Can any owners give me an explanation? Thanks.

 

[BertTheDrummer]

From Trick's Website:

The primary differences between the Dominator and Pro 1-V/Bigfoot are:
Less metal utilized, bringing weight down a bit
A larger, more traditional aluminum beater
No adjustment cluster or Slide-Trac
Only available as a long board

 

[SlitYourDrums]

From Trick's Website:

The primary differences between the Dominator and Pro 1-V/Bigfoot are:
Less metal utilized, bringing weight down a bit
A larger, more traditional aluminum beater
No adjustment cluster or Slide-Trac
Only available as a long board

Sorry, I didn't notice anybody even replied!
Anyways, what exactly is the slide-trac?