I thought I'd update and share my 9 month experience on low dose HRT.
Due to miscellaneous reasons (career, marriage, sort of gender neutral identity with bias towards female), I don't forsee myself transitioning anytime in the near future, or ever. For me, the cost to benefit of transition just isn't there for me at this time - if it weren't for my GID, most people would say I'm on a pretty good wicket.
This year, I decided to start low dose HRT for a few reasons:
1. Possible improvement in emotional stability
2. Reduce the level of gender dysphoria
3. Prevent further recession of the hairline
4. Prevent further development of male pattern body hair. (I found as I was getting older, I was getting more body hair!!!

)
Currently I'm on a combination of progynova/spironolactone, dosage is approximately half that of what one may possibly take to stimulate changes desired for transition.
What I've found happened to me are the following:
1. Emotionally I feel more connected with myself and others around me. Some people in my family have said I've become moody. Libido has dropped significantly, and I have to same I'm pretty happy about that. For those who really need to know, things still work downstairs, but production is way down.
2. Gender dysphoria is more or less controlled. I do not feel the desire to take things further at this point in time.
3. Hairline has stabilised, and some small amounts of scalp hair at the corners have regrown.
4. Body hair has started to thin slightly.
5. Skin is no longer oily meaning far fewer breakouts. My endo says that I look about 10 years younger than my actual age, but I think he says that to flatter everyone on HRT. ^^;
Even being on low dose E, there have been some feminising effects.
Breast growth has been minimal, they're AAA size, but still get sore as anything when they get hit, and movement is felt when I'm running. Nipple diameter has increasted to about 4mm. If I were to classify them on the Tanner scale, probably a 1 to early 2.
Some loss of upper body strength, but it's nothing that I can't compensate for by being smart about how I do things. There has been some shrinkage in the deltoid and tricep muscles. Fortunately for me the skin has followed, and they don't look like tuck shop lady's arms at this point.

Body fat has migrated downwards towards the thigh/buttock region.
My body weight continues to yo-yo, with a varience of about 6kg (13lbs) depending on diet and what I happen to be doing at the time. I am not looking forward to eating too much over this coming holiday season.
Unwanted side effects:
1. Hypotension - my blood pressure has varied from being perfect to being under. Under = near fainting fits when I try to exert myself. I've had bad salt cravings over the last few months.
2. Thirstiness - hydration has become much more important, and if I'm dehydrated, I can develop cramps fairly easily.
Overall, I'm fairly happy with where I'm at emotionally right now regarding my GID. I'm hoping that my changes will continue to be minimal at my current dosage, but I suspect I will probably need them reduced at some point. At this point I would be happy to make the suggestion for those who are unsure about transitioning to consider low dose as a diagnostic aid or possibly symptomatic relief for GID. I'm not saying that this is for everyone, but it's keeping me sane at this time.