Finally got out for a throwing session (albeit relatively brief) with these Blizzard discs. Observations:
150g Blizzard Katana: Very domey & stiffer than I have come to expect with 150-class Champion plastic. Curiously, much more overstable than any other Katana I have thrown. Very turn resistant, even when thrown 100%. Predictable, but small, low-sped fade. Not as glidey as other Katanas I have thrown. Me no likey.
150g Blizzard TeeDevil: Very domey & stiffer than I have come to expect with 150-class Champion plastic. Nothing to which to apple-to-apple compare, because this is the first TeeDevil of any flavor or weight that I have thrown. That said, it reminded me somewhat of a 150g Pro Vulcan, but with more low speed stability. At typical driving power, it turned just a wee bit, followed by relatively massive fade as soon as things slowed down. It really shone for full-power high pure hyzers, and, after further testing, I would consider replacing the R-Pro Boss in my bag with this disc for those types of shots, as it seems to be longer & less squirrelly.
150g Blizzard Boss: Very domey & stiffer than I have come to expect with 150-class Champion plastic. Very similar to new 150g R-Pro Boss in flight. Strangely, less low-speed stable than the Blizzard Katana, providing a pronounced turn. Consistent fade. Like any Boss (in my experience), this is very sensitive to release angle, with the difference between a "turn all the way to the ground" angle, a "baby S-curve straight" angle, and a "dammit it didn't flip up hyzer" angle being very slight. As the R-Pro Boss quickly beats to a more usable disc (and the TeeDevil may replace it anyway), this will not be seeing the bag full-time.
150g Blizzard Wraith: Very domey & stiffer than I have come to expect with 150-class Champion plastic. The gem of the bunch - the best Wraith I have ever thrown. Very neutral flight & glidey as all get out, like a MUCH longer Viking for me. Beats the crap out of 150g DX or Augusta Wraiths. Got my longest throws of the day with this beauty, including airmailing a hole that I rarely reach with a 75% control snap that I didn't even get perfectly. This one will almost certainly go in the bag for long, straight distance crushes.
When my 150g Blizzard Destroyer arrives, I will post my thoughts on it, as well.