This is probably the definitive British blues album: it sounds like it could have been made by Americans in the US, it features great playing (particularly by Clapton) and I don’t know of any other pre-psychedelic blues album from the UK that is remotely this good.
There is just one minor problem: by the time of its release, it was almost out of date, as both Clapton himself and Hendrix would absolutely transform blues-based guitar playing beginning only a few short months after its release. Had Hendrix not come along, maybe this album would be the gold standard for blues-based rock guitar for years. Instead it was for mere months (if you elevate it over what the Paul Butterfield Blues Band were doing at the same time.)
Still excellent for what it is.