These are among my favorite games of all time, in fact Shenme II is number one on my list. I've played both games so much that I broke three Dreamcast GD-ROM drives. Needless to say, I am overjoyed that they received a re-release on modern console and PC systems. The design and aesthetics hold up well, even nearly 20 years after their initial releases.
Anyone who has not played this franchise should know going in that the pacing is very slow. This is intentional. Yu Suzuki, the creator, wants the player to get immersed in the world, and few games have pulled this off so well. You truly feel like you are exploring real-life locations in the time period in which these games take place.
This said, I have to be somewhat critical of this re-master. Despite a day-one patch, there are still many significant bugs. I've experienced glitched cutscenes where you cannot see the characters interacting. One of the QTE (quick time event) mini-games you can play refuses to register up on the directional pad, screwing me out of getting high scores. There is noticeable input lag when navigating some of the in-game menus. Some in-game sounds flat out refuse to play. I have my fingers crossed the developers will address these issues.
One thing that cannot be fixed, however, is the quality of the audio. It sounds as low fidelity as it did on the Dreamcast. Unfortunately, the tracks could not be remastered without re-recording everything, so it's understandable. Just be prepared when you go in.
Overall, the mere existence of this collection is a very positive thing. I just wish it had a little more "time in the oven" so players would have a more polished experience.