I bought the surround and play it every day; it's been my main organ for quite some time (year? 2 years? I've lost count).
This organ is the clearest I've heard in a HW sample. You can have a very dry sound with the surround by moving the faders down. It can also sound quite reverberant when you move the faders back up. It's small enough (in terms of ranks) to be nimble and precise, and also large enough to offer variety. This organ is right in my sweet spot for sample size and acoustics.
It's not perfect, I find one of the 2 tremulants to be "too fast" (but this is a problem on the real organ, not a flaw in the sample itself), and a few other minor quibbles, but I highly recommend it.