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

Information about commercial licenses is available here.