This has nothing to do with rooting, but if you are looking to buy, my suggestion is to stay away from 'Allthatcellular' of NYC, they do not work with customers, and my defect was under a 14 day refusal, and they never responded to my several calls, Emails or anything, LOUSY business practices, ignore the customer when you have issues with their devices(mine was bleeding screen).
They bill as wireless connections, but I have 15 calls/texts/MMS messages that were never responded to, the machine answers, but you NEVER get a live person!
Stay away from this 'business'...a shame really, as we have made several purchases in the past, but when the defect arose, they ignored us.
We also noted that what they offered, is not what you bought. We were sold a pair of Droid 2, A956 GLOBAL devices, and what we received were the A955 version.
We brushed it off and forgot about it, until the final problem with a leaky Droid X. This is when they began ignoring our calls, and I finally posted their information on my FB page so others would know of their practices.
As for rooting issues, there are generally none, you can root and unroot all day long, as Dezyond states, and you can easily reset the device back to factory, from the phones settings menu.
If you have no need for root access to your phone's file structure, or feel unsure about using such capabilities, then you should hold off until you are certain you can properly use this function.
And I also agree with Dezymond on Swappa, also.