There isn't much of a point to watching this over the original OVA version of Stardust Memories. While I found this film very enjoyable, almost everything done well in this film was done just as well if not better in the original version. The only thing I feel that's done better here is the climax, which feels better paced due to it being in one continuous film rather than split into multiple episodes. Editing the OVA into a film results in much of the content being removed and this hurts the development of characters and the conflict they have to deal with. The first arcof the film is also shown as a recap which gets the information across in a time efficient manner, but is extremely boring by comparison to the OVA's opening arc. The only scenario I can recommend this over the OVA version is if you've already seen that version which is what I did, this just allows you to blast through it again really quickly. Other than that, just watch the OVA instead of this.