I have a sekonic L-358 and the 1degree NP spot attachment , It's definitely not junk, I bought mine new last year it cost £125 ( about $198 USD) and It's probably saved me more than that in wasted film, I don't shoot L/F just 35mm and 120.
The 1 degree spotfinder enables you to take up to nine spot reading and put them into the meters memory, then average them at the push of a button, It's magic.
I don't consider this finder expensive compared with buying a seperate spotmeter, the only drawback it has is It's size, It's pretty big about three inches long and one inch diameter.
If you can find one second hand cheaper all the better, but I couldn't, or find any local stores that had them in stock, I had to order mine from a local pro dealer who ordered it from the importers for me.