I bought this for my 5w practice combo, to replace a Celestion Vintage 10. It has brought the amp to life. The Jensen is a more "hi-fi" speaker, with richer highs and lows and less of a mid-hump. The amp no longer sounds like a little box.
My only negative is that it is slightly lower sensitivity than the Celestion, so the amp isn't quite as loud, although it's not a big difference. It still keeps up with the band, as long as the drummer is easy on the cymbals.
I think these are a great alternative in a 1 x 10" configuration. Probably good in 2, 3, or 4 x 10's too, but I wouldn't know.