Havent soloed much on mine since its really fun to play in teams.
I can only speak for the fire/ side of things since mine is fire/dark (lvl 44 atm) but i can safely say that it is VERY powerfull.
Your burst damage is insanely high and with the resis/healing flames/damage aura youv got . . . . . you should tear through mobs with ease at the higher up levels.
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Your burst damage is insanely high and with the resis/healing flames/damage aura youv got . . . . . you should tear through mobs with ease at the higher up levels.
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I would agree with this!
Fire/Fire is probably the most powerful scrapper out there from a damage point of view and will be able to solo well through all levels.
It's also probably the weakest from a survivability standpoint as the Fire/ primary offers nothing (besides killiing everything around it) to mitigate damage which the /Fire secondary needs if pushed hard.
Personally if I was going to run a /Fire I'd go BS/Fire or Katana/Fire for additional defence or Dark/Fire for the extra Heal/-to hit/ and Soft Hold (Touch of Fear)
If going Fire/ I'd make a Fire/SR - great damage and great survivability especially late game - IMO the best scrapper around.
So basically yes Fire/Fire will be able to solo and will be an engine of destruction.....but for me a little too squishy.
That's just my two penneth worth. 
L50s: Tanks: Cryofission - Ice/EM - Dr Celsius - Fire/Ice - Saint George - SD/SS | Controllers: Psichosis - Ill/Kin - Major Chaos - Ill/Stm | Scrappers - Neutron Crusader - DM/SR
Currently Levelling: Angelic Blade - BS/WP Scrapper | Seeds of Destruction - Plant/Kin Controller
For solo play scrappers just need a status protection from their secondary. For normal missions you can solo with just your primary so long as you're not being held
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
My main is my much loved defender, whom I use whenever my party is around (Shame I can't go out level them, would annoy 'em).. So I wanted something for solo play. Scrapper seems quite fun, I haven't made one past 10 before..
So I tried fire/fire, so far it is level 8 and I am in love, but it is really hard to judge how well a power combo can solo, because at these low levels, everything can solo.
Friend of mine has a MA/Regen scrapper whom is crazy good at level 40, is Fire/Fire good as well, or will I suffer from a lack of health regen.. Or whatever. Oh, I do plan on getting health/Stm right away, getting my super speed later at 24.
@Golden Angel
Power Clover - Inv/SS Tanker - Freedom
Arcane Clover - Emp/Psy Defender - Freedom