I remember first seeing this game on display in Stereo Studio in Aalborg around 1999. When I first saw it, I didn't really like it - the first generation 3D graphics was ugly compared to the 2D graphics of the earlier games. However, I have come around on this - Delta looks pretty cool for a 1998 shooter.
All of the games I burned with ImgBurn on default settings (except for 16x write speed, just to be safe), works, but my old PlayStation has trouble streaming audio and video. R-Type seems to work fine in stage 1, but then fails to load stage 2.