Bear Wallow: I own four older model BLRs, all with the steel receiver, including one which I purchased new in 1981. I find them to be a very pleasant rifle to handle and carry, as well as being well constructed. Their main weak spot, IMO, is a heavy trigger that has noticeable creep, but that is something that you never notice in the field.
The newer, aluminum receiver models were introduced in 1996 as the BLR Lightning and also feature a folding hammer design that provides an extra safety position. The problem with it is that its design prohibits the use of an hammer extension, which I have on all of mine and find quite handy. The aluminum models also originally had a curved pistol grip and lever, unlike the original models which had a straight grip. In 2003, Browning introduced the New '81 BLR which brought back the straight grip and, in 2005, added a curved - gripped model to supplement it. You should try to handle both grip styles to see which one appeals to you most - if you like the curved version, then you will be limited to the newer, aluminum models.
When it comes time to head to the woods, I always reach for a BLR ........