I recently won a copy of their anthology on ebay and I was pleasantly surprised how consistently good it was from beginning to end. Unlike some of their brethren in the NWOBHM movement, they didn't soften up their sound (too much anyway) after the first album or 2, looking for a radio hit. They played traditional melodic metal till the end. As far as the Anthology collection is concerned anyway.
I'd recommend it.
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I used to be with it, but then they changed what "it" was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you, too.