If you buy now, you'll get:

Instant key delivery.

A 30-day money-back guarantee for the program.

The program can be used on several computers you own.

Up to 3 installations per month.

The license is permanent and includes one year of free product upgrades since the purchase date, including even major version upgrades.

A 50% discount for updates for one year.

Priority technical support.

Personal licenses:

Chameleon Window Manager Pro	Chameleon Window Manager Standard
License for 1 user - $29.95	License for 1 user - $24.95
License for 3 users (1 license for FREE) - $59.91	License for 3 users (1 license for FREE) - $49.89
License for 5 users (2 license for FREE) - $89.85	License for 5 users (2 license for FREE) - $74.85

Lack of features in the standard version:
Most of the new features
Configurations management Any number of configurations can be created and loaded if necessary
Layouts It is possible to create a rule for any window based on how it should be repositioned and resized
Repositioning the window by "drawing" it on the grid The new position of the window is specified by selecting it on the 12*12-cell grid with the help of the mouse
Extended AeroSnap Move a window so that the mouse pointer is near the edge or in the corner of the screen and select one of the layouts
Scroll inactive windows with the mouse wheel

Information about commercial licenses is available here.