No trouble, but there's no need to force the hard disk to continuously record for casual TV watching. Also, if HD (DVB-S2 in my case) is supported in the future, disabling timeshift would prevent from eating away disk space (SD MPEG-2 channels eat plenty of disk space, too). Also, when working on disk-intensive tasks (e.g. copying large files) it's not wise to add extra load on the disk (if watching TV at the same time I mean).