So far the unit (and the sales-service by Strobepro) has been fantastic.
We use a mix of fast flash-duration battery-powered Profoto Pro packs and Elinchrom Quadras with our Hasselblad given it's high sync-speed.
However, having acquired a GFX50S to go with our H5D-40 due to the Fujis' ability to use HC lenses, we wanted some HSS ability (backed by hefty Ws) given the low sync-speed of the Fuji to allow us to use HSS vs. ND filters all the time when using Fuji lenses or Hassy lenses on the GFX with the Fuji body shutter selected (vs. the leaf-shutter on the Hassy lenses).
As we work with a lot with animals, the ability to use spot-metered TTL for the first shot and then 'lock-it-in' for tweaking helps keep light-testing time down and helps us better exploit an animals' (often short) attention-span.
We acquired the AD1200 after being very impressed with a used AD200Pro we acquired 'on a lark'. The 1200 is well built and very well thought-out (as is the rolling case and various accessories that come OEM).
Controls are a no-brainer and the build quality is far better than the Eli Quadras and on-par if not better than any post-Ranger Elinchrom units.
Our only two wish list items are:
1. Make the fan temp-controlled vs. always on.
2. A rubber cover-flap for the Broncolor-esque cable socket. Lots of tiny holes there begging for dirt entry.
Looking fwd to using it and a forthcoming R1200 ring flash (sans shroud) in our Bron Para once we DIY a low-profile Bowens adapter.