I had some Penguins [110] and tested 12 of them for a few days.
My stock impressions are the same as Sifo. The stock Penguins have a less-defined tactile profile than MX Clears. They are smooth but absolutely need lube.
Once lubed, the stock Penguins still have a nebulous tactile profile, but they operate fine. The sound is very good, Penguin housings produce deeper sounds with all stems I tested.
The trick is to replace the stock stem with MX Clear. Then, it becomes a true Ergo Clear. You only need to lube the legs (!). Don't lube other parts of the Clear stem, just the tactile legs. Then it operates fine at 63.5, and is tactile.
I tested the Penguins with other stems. MX Brown with 60 G TX produced a smooth, deeper-sounding switch, but it was a bit hollow and clunky sounding as well. Pro Purples work in the housing, but are nothing special as far as I can detect.
The whole experiment with Ergo Clears and Penguins taught me that I don't really want 63.5 G Ergo Clears of any type. I don't like the weight, as it just feels like a heavier MX Brown to me. I prefer to go with 60 or 65 for tactiles. I still enjoy 63.5 for linears like Alpacas/Silent Alpacas.
Penguins should be fine for anyone looking for an alternate housing for Clear stems. I don't think there's a tactility problem with these, just don't go under 63.5.