I have over 8 years of use with proscar/propecia and dutasteride/avodart. Avodart since Dec. 2002.
I am prone to hairloss. I have used the following while using avodart without hairloss:
Test
DBOL
Anavar
EQ
One thing you have to remember is that avodart/duta is very powerful at suppresssing DHT. What happens to many people (including myself) is a shedding of hair when you first use it (was worst for me around month 3). People think the shedding is bad, and it is bad to the ego, but actually a good thing. What happens is the massive reduction in DHT causes the effected hair follicles to end their growth cycle and start a new one (the hair cycle is very long) when the growth phase stops the hair detaches and will fall out. Naturally you lose about 100 hairs a day because the hair on your head is in various phases of the hair cycle. The dht reduction can cause many hairs to start a new phase at the same time, thus causing many more than 100 hairs a day to fall out. Why is this a good thing? Because it means the reduced dht is having an effect on your hair and the next growth cycle will produce a slightly larger diameter hair with a longer growth cycle. Eventually this leads to a desired cosmetic look in the mirror (a thicker head of hair).
Problem is, you need to use avodart for 9 months to a year to see the full effects due to the length of the full hair cycle, and up to 2 years or more to see the complete benefits you can get out of it for growing hair.
Proscar/propecia is less known to cause shedding and may be a better choice if you just want to use something short term when on a cycle.