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Haven't ordered one. SV Bony are capable of producing excellent optics. I have a pair of SV Bony SV202 10x42ED's that are excellent.
For around that same price, you can get a Samyang/Rokinon 135mm f2, a fantastic tack sharp wide field astrographic lens. They are sharp wide open but with vignetting.
Add a quality 1.4X converter and you have a 200mm f2.8 and a 2X converter and you have a 270mm f4, not that different to the Redcat. Either of these will only have 45-55mm back focus depending which mount you buy so it depends what you want to hang behind it.
DSLR - no problems.
Dedicated Astrocam with filter wheel etc - you'll need to check back focus requirements.
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