Maggie:
I have to admit that I am ignorant on this subject. But I did do a quick google search. My initial impression is that while pellets are reasonable to use, they do seem much more expensive overall. ($250+($60*9))*3=$2370 / year, while my delestrogen at $60/vial / mo = $720/year.
Also, the research I looked at was exclusively cis-female related. No research has been done regarding us trans folks. I did see a couple of "no adverse effects", though I get the impression it is as compared to regular HRT.
I am not a fan of mega-dosing estrogen. You may recall I had a 4200/dcl estrodial once and my doctor freaked. Time and again it has been explained to me by multiple doctors that more estrogen does not me bigger tits! And mega dosing estrogen to overcome testosterone was done back in the day of Christine Jorgensen, before the discovery of anti-androgens. Besides you've already had an orchi so you aren't carrying around that much testosterone in the first place.
Personally, I would steer clear if for no other reason as the cost. It might be convenient, but at a really high cost.
-Sandy