I've had several Topaz books. Haven't sent one back yet. I remove the DRM and convert to Mobi for long term storage and archival, but generally leave it in Topaz format on the Kindle for reading. The result is slower page turns, certainly, but an overall better result than the conversion.
OTOH, if the publisher has an ePub version, and I notice it in time, I'll buy that one by preference and convert that to Mobi. Almost always a better result.
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