Cella-bration, come on...

Personally, I like Cella -- mostly. The only negative that I can think of is its consistency out of the tub. It's a little sticky and gooey, which makes face lathering a bit more of a challenge. It bowl lathers great though and the performance is very nice. I also love the almond scent -- it is almond right?

Been using it all week

I heard the 1KG is even better for some reason. I'm going to grab one next.

For me, it's one of the best bang-for-your-buck soaps out there. In terms of performance, it rivals soaps that are twice or three times its price, and comes in a very convenient, travel wise, container. It's likely that it'll be the one I'll bring along with me next summer when on holidays.

I have also heard guys stating that the 1 Kg brick performs better. Not that I'm willing to test it myself. With only seven soaps in my rotation and already realizing that I have well over a year worth of shaves, I wouldn't buy 1 kg of soap unless I'd be sharing it with at least other ten fellow wetshavers.

Owned the red tub. Used it 3 times in 2 years. Found out it had turned a bit. I own a good number of soaps, so often neglect soaps in my den. Threw it out.
Then got a deal on the 1 kg brick. Somewhat firmer. Have now used the 1 kg brick twice. It performs very nice, and from memory, a bit better than the red tub.

A true classic.

I also think that the Cella brick performs a little better than the red bowl. The company clearly states that the Cella in the red bowl is soft cream, while in the big packaging is soap. There must be slight differences in the percentages of each ingredient listed.