I like how it can crawl my site while i'm sleeping or doing something else with no hassle! It's very easy to use as well (i've only used it once so far). Sometimes when crawling there are errors but they don't seem too bad. If it doesn't find anything wrong at first try after some time of using it will be fixed by itself in most cases. Try if you have nothing against new things to test your sites performance before going live. Just make sure everything works without any problems afterwards. Since we're still working on our product this hasn´t been one big issue yet just minor ones here and there which could probably work out easier than expected due to its ease-of-use and speed of finding issues.