I have plenty of VLB caching controllers, they speed the system up because the built in CPU (286-20) takes the load off the CPU. The cache does help out the transfer speed as well. VLB machines have limitations on how big of a HD they can use, and drives that are usable are not that fast (IDE).

The 5MB/sec must be SCSI 1, the later Jackhammers and SEIV will smoke that card. Still its a nice card for an old Mac II, IIx, IIcx.