Thanks for the review! I think I'll get one of their dirt colors to try. The Maimeri Artisti line is another really good paint from Maimeri, although hard to find in the US. There are a couple of listings I found on ebay. 60ml tubes! I bought some yellow ochre and a fast drying white a couple of weeks ago off of ebay, very reasonably priced. The ochre was 2 tubes 60ml each for $22. Good stuff.

Ultramarine deep is meant to be a more purplish shade of blue than the regular. Maimeri Puro is a good professional quality brand, albeit expensive. Their chief selling point is supposed to be that the entire range is made with safflower and poppyseed oils which makes them smoother and yellow less than linseed based paints. Although I prefer linseed myself, I do like their now sadly discontinued Avignon Orange PR206.

I've never seen burnt siena that opaque, the bottles I have are transparent like the Sennilier. I might give Maimeri a try due to the nice consistancy you describe.