As outlined in the original 'megapost', STREAM series combined the functional and performance elements from both PULSE series and ZEN Mk3 series. If we had kept PULSE series then this would have been very confusing, and the PULSE and PULSAR in particular would have been quite redundant against STREAM1 and STREAM3. We did actually consider whether to keep the PULSEmini a bit longer, solely based on its price point, but this would only have added to the confusion around the new product line-up with some models discontinued whilst others remained from the same range, etc.
The STREAM1 would be considered an upgrade over the PULSEmini - it's CX power regulation is a sound quality improvement, along with all the other functional benefits as outlined in the original post. That said, if none of those new features are of benefit to you, then no problem in sticking with what you have!
