Addressing the "older" model compatibility with Strato question, here's a refresher.
Kaleidescape has two completely separate entertainment systems, the older Premiere line, and the newer Encore line.
PREMIERE line:
Servers: 1U, 1U+, 3U, and 5U (The 1U+ is the newest Premiere server and the only Premiere server still available from Kaleidescape.).
Players: Current players are the M-Class players (M300, M500, M700 (Vault/Player combo). Older Premiere players include the 5000, 6000, etc.
Player/Server combo: Cinema One (2 gen's)
Vaults: M700 (noted above), and the DV700 (originally Importing and disc storage only, but later modified to playback the stored physical discs when paired with the Alto. Can also playback physical DVD (not BR) when paired with a Strato). There is also an older KVAULT-10 that was used while K was developing its own Vaults.
The Premiere line works with both physical discs (Imports them), and the K Store (downloads content). It does not directly work with the Encore line (i.e. components are not compatible), and cannot access any of the content stored in Encore components.
ENCORE Line:
Alto Player: 6TB is only available Alto from K. (Cannot playback 4K content)
Strato-S Players w/storage (currently only 6TB and 12TB available from K).
Strato-C player (no internal storage, playback only)
Terra Servers: Currently two storage options, 24TB and 40TB.
With exception to playing back physical discs from one of the Premiere Vaults, the Encore line gets all of its content from the K Store, and cannot access any imported content stored in a Premiere system.
The Co-Star Switch Kit (and subsequent Co-Star licenses for Crestron and Lumagen) allows the content stored in both systems to be accessed from the On-screen guide simultaneously, but playback will still be restricted to the appropriate component (i.e. select a movie stored in Premiere and the Premiere player connected to Co-Star is used for playback, the same for Encore).
Jim