I used a Delta 1010lt for several years in combination with Cubase and Windows XP. I guess that the quality of the 1010lt should be very similar to the 1010. A few month ago I replaced it by a Motu 828 II Firewire interface.
The biggest advantage of the 1010 is from my point of view the reliability of the drivers. I never had any severe problems and latency was always acceptable low.
Due to sound quality there is an audible difference in comparisson with the Motu-interface. The sound is not as brilliant and full of dynamics.
So I would conclude that the Delta 1010 is a very reliable midrange soundcard but it is not a professional one!