The Pioneer A03 and A04 drives cannot do DVD+RW/RW only DVD-R- which is arguably the more compatible of the current formats. The Sony DRU500 drive does them all but is not supported by all authoring programs so you should contact the makers of Impressions to confirm compatibility. Check out this article:
http://computers.cnet.com/hardware/0-1095-8-20461160-1.html?tag=st.cn.sr1.s...
Noah