inexpensive diplexers from MCM Electronics, any good?

[Arv]

I did a search for "diplexer" and I got half a dozen at under $3 (five at $3.19 or less and one at $5.29). Most of them does DC pass through. Are these any good? I was thinking 4 at $10 at HD is $40! Savings? Or you get what you pay for? There's one by Tru Spec for $2.99.

Thanks!
Arv

[Arv]

anyone???? I've heard of the brand Tru Spec but I'm not sure what the quality is.