Especially for Mac OS X users, LennarDigital now offer a Sylenth1 + SoundRadix 32 Lives bundle with a 25% discount: 159 Euro (ex. VAT).
This bundle includes the full versions of Sylenth1 and the SoundRadix 32 Lives 32-bit to 64-bit adapter for OS X Audio-Units. It will allow you to run Sylenth1 smoothly in Logic Pro X as well as any other 64-bit Audio-Unit host.
This offer will be available until the 64-bit version of Sylenth1 is released. The 64-bit version will be a free update for all customers.