There are basically 2 types:

wash-down - water gush down from the cistern by gravity
- greater force but noisy
syphonic - wash drawn into wc by suction
- less force but quiet
Then, there is the push-button and the level handle. The former has more problems.

To save water, there is the dual-flush system where you have a choice between a full-flush and a half-flush to save water.

There are pros and cons, it's a matter of individual preference.

Orin is China made. Not sure about quality.

Imagine you have a wash-down w.c. and you go to the toilet to use it in the middle of the night while your partner is sleeping. The noise can be a bother.
For home use, you don't need the flush to be so powerful, unless your 'chocolate' is so sticky that it's difficult to wash off.

This post has been edited by tehtmc: Feb 15 2012, 12:32 PM

Actually, there was only the wash-down system in the old days.
Then the syphonic system came in to the market due to demand for a quieter flushing system.

Anyone used "Cotto" brand w.c.?

It is a Japanese-Thai company (related to the famous' Toto' brand) but made in Thailand.

The fittings are quite stylish.

Cotto is supposed to be based Toto design but is more affordable. Wonder whether quality is there.