I certainly would not criticize the Tascam hardware I have used. I have used the FW-1884 flawlessly for many years. It is a superb design.
My disappointment, shared by many on this forum, is with the drivers. The driver for this (and a few other similar firewire devices) is actually written by Frontier Design, but is released by Tascam. In the case of Windows 7 64-bit and SONAR, we had to wait a year for this driver, only to discover that Frontier Design basically had it all along. Right after that, Tascam posted on the product website that there would be no more support for this unit.
We know, from the Tascam Users Forum (Tascam itself has no user forum; this one is run
by the users) that the FW-1884 can be made to run under Windows 8.1. We also know that Microsoft made some changes in Windows 8 that makes that installation quite difficult, involving unsigned drivers and legacy drivers.
Please, Cakewalk, Gibson, anybody: for all the users of SONAR who use this gear that is still fine, the FW-1884 and 1082, ask Tascam what can be done to make the transition to Windows 8.1 more seamless. It should not be that difficult, because it can work. For all we know, Frontier Design may again already have the driver we need. This is the only hardware that is preventing me from moving to Windows 8.1. I am willing to help organize users and, speaking for myself, am willing to pay for the updated drivers.