No short answer possible here, since -- Cliffy has a bunch of different product lines.

1) I use his flipper return guides on almost all my 1980's machines to give me like-new ball travel towards the flippers, which to me is the most important aspect of the game. I can't think of a more important after-market purchase I've made. It's my #1 most-looked-forward-to purchase whenever I have a new acquisition.

2) I use the long flat "flaps" that replace stock flaps, like in Centaur. I think the stainless steel improves the look.

3) I do like Cliffy's for holes/cellars, so I have Cliffy's on my Whirlwind and Black Knight. In some cases, it's improving the look as well. Some games look better with more stainless steel in them. Black Knight and Centaur are two good examples of that.

4) As for protecting inlanes, I'm not a fan of seeing metal in the inlanes, so I skip those inlane protectors, regardless of the wear. My feeling is I should eventually learn to repair those areas.

5) Colored post rubbers. I just buy kits, and so I never pay attention to where my colored posts come from.

In short, he has a lot of products, and you should try them all out, and see which ones you like the most. Just buy more of the ones you like a lot.

-mof