Original sentence: Both binary and source versions have been downloadable without cost at various times, although under changing terms and restrictions as Sun explored a number of business models.Solaris is tightly integrated with Sun's SPARC hardware, and is designed and marketed as a combined package.This has often lead to more reliable systems, but at a cost premium over commodity PC hardware
Edited sentence: Due to the tight integration with the hardware - since both are produced by the same company - there is more security and stability.Hallmarks that have earned Solaris the reputation as one of the best Unix variants.However, both binary and source versions have been downloadable without cost at various times