ZALMAN's 128 GB SSD delivers the same performance as other 128 GB SandForce drives from bigger and more well known manufacturers. While on one hand this means that ZALMAN does not offer any specific improvements over other companies, it also means that you will receive the same high-quality Sandforce experience, as you would with other companies.
In terms of performance compared to a traditional HDD you will see substantially reduced waiting times, general system snappiness is considerably increased. The only drives that are really faster, are the new SSDs that use the 6 Gbps SATA interface. For users of motherboard without that interface the gains are not as spectacular, so a Sandforce 1222 drive will still be a good investment. Also it should be noted that Intel's new 510 Series SSD is considerably more expensive than the ZALMAN N128, both when looking at Performance per Dollar and Performance per GB.
Overall ZALMAN's drive is a solid entry into the SSD market and a good choice for all users of SATA-II motherboards.