Got message that mine (regular non-SE version) is on the way, should arrive this weekend. Pre-ordered from a US dealer (not Sweetwater, discovered that they charge tax on online orders now, don't recall if they did in the past). So looks like first batch may have shipped, but may have just been enough to fill pre-orders, maybe a few extra-site I ordered from shows "arriving soon" status now.
This will be the first keyboard synth (apart from a used Monologue, currently on loan to a friend) I've bought in at least 5 years, been focusing on Eurorack modules when I had spare $ for music gear. Even though the various demos on YT varied in quality, I could tell the Pro 3 has a ton of potential for creating the type of sounds I want in a monosynth (70s era Berlin school stuff, prog & funk leads, ambient melody line stuff, etc). What really tipped it to a purchase was the speed and ease of operation, especially the sequencer and mod matrix. Sequencer can do ratcheting, record parameter tweaks on separate tracks, record/edit velocity, output CV/gate to my modular-ideal. And reading the manual on the Sequential site (a refreshingly clear and complete one, I'm a tech writer myself), apparently you can even scale the CV output if pitch scaling/tracking of your external VCO module across several octaves doesn't match the Pro 3!
So very appealing as a modular controller even apart from the great (IMO from what I've heard so far) internal sound engine. I like the 2 analog+1 wavetable osc configuration-I often mix a pinch of E352 (wavetable VCO) in with several analog VCO waveforms when working on my modular to add some sparkle or a different, less traditional timbre. Modulate the wavetable to add some evolving movement. Basic FM appears to be simple to set up in the mod matrix, although it's not linear FM, much less through-zero. I have an SSF ZPO and an FM Aid in my modular for that, along with a Nord G2 Modular kybd. And with a 3-octave keyboard, it's small enough to fit in the space I have in mind for it (already have a primary MIDI keyboard with 5 octave range for "piano" and other serious poly playing).
Final thoughts re sound/features: I owned mono synths including a Moog Source, Korg Mono-Poly and MS-20 (and played a Pro 1 in a session) back in the 80s, and they were great, but sometimes the whole "vintage" thing is a bit overstated-I have little doubt I can get the Pro 3 to sound at least as good with some time spent programming and exploring, and then there's the whole reliability/parts issue. For that matter, I have a few excellent software synths like the Synapse Legend (minimoog), Gforce Oddity 2 (Odyssey) and Arturia Moog Modular that are so good (key is using a high quality audio interface IMO) that non-synth geeks would be unlikely to hear any significant difference (but hardware will always be more fun and immediate, no CPU load, OS update issues, etc.). Oh yeah-think all the Pro 3 knobs output MIDI CCs, so will also be fun to map them to corresponding parameters in those VSTs!
Anyway, I'm excited and can't wait to set it up in my little studio and dive in-will be an early 65th birthday present to myself (hopefully will be able to pay myself back in next few months from tax refund and/or annual bonus from employer). Pardon the long post, just wanted to share my take on this cool new puppy.