It’s a great dictionary for historical linguistics research. It’s terribly antiquated and completely unsuitable for general use. Great in its day, but dictionaries, like any non-fiction book, doesn’t wear the years well.
I have mixed feelings about putting old dictionaries (and other language resources, like grammar manuals) online. On the one hand, its great to have them readily available and free. On the other, I’m afraid the general public will choose them over up-to-date dictionaries (which often charge).
There are several excellent and free up-to-date dictionaries available online. Such as Merriam Webster’s Collegiate, but that’s reasonable) and American Heritage. For most purposes, either of these will be far superior to a 100-year-old dictionary, no matter how great it was way back when.