It is a good download manager, but it lacks on quite a few features that would make it an ultimate one:
1> the re-try on errors is less than functional. I am not sure what the developer calls "temporary" errors, but it never attempts to re-try the download even on short local or remote host connectivity issues... if you have 100 downloads in the queue, it all will change to failed within a second.
2> pre-allocate space before download: ( as an available option )
a> it does prevent "huge" fragmentation of the downloaded files when multiple downloads are running at the same time
b> it does not download the actual data in case there is not enough of disk space available which also prevents corruption of the downloads.
3> there is a substantial performance hit, after a while of use, if multiple files are being added ( one by one ) to the queue with 'OneClick'. Stopping the download, closing the tab, and often exporting/importing the links are needed to get the plugin back to a usable state ( Win10, and Linux ).