The main selling point of the Dobinsons arms specifically is that the ball joint is sealed, like OEM, meaning that it's built to be "maintenance free". Someone correct me if I'm wrong, but all of the other arms on the market are NOT completely sealed (even if they look like they are with some kind of cap or sleeve) and therefore will require grease to flush out tiny bits of debris that gets in the joint while driving. Greasing also keeps the squeaks away.
Depending on your usage, unsealed uniballs and balljoints can also wear out faster, but this admittedly will take some really hard driving if they're properly cared for.
That I can tell, the upside to the Uniball / Unsealed Balljoint route is the travel, as in, you'd need them to fully take advantage of extended or long travel. I can't specifically tell you that Dobinsons arms have LESS travel than a uniball or unsealed ball joint, but maybe [MENTION=148378]Dobinsons Mike[/MENTION] could...
I can tell you I am lifted 2.75" on the Eibach kit and haven't needed UCAs specifically to correct alignment, everything is technically in spec. Having said that, I do plan to add some soon because I can feel the difference in the steering after the lift, that "floaty" feeling. It's not terrible but I'd like more caster than my OEM arms can give.
