Define "reliable"... Whatever response about product quality you'd get on the forums would be anecdotal and in no way statistically significant. You could contact NI directly to get an Mean Time Between Failure estimate, which is the closest you'd get to an actual number that represented (on average) how long you could use it before a component failed. You can also check the specs for accuracy over temperature and time. For anything beyond that, please share specifically what your concerns are to get a fruitful response.
