These are just the same as the multifloor and animal versions but without all the extra bits which personally having the dc25 multifloor i never use any attachments.
A little bit of information i have found out about these.
There is actually a very simple difference between the DC50 and the DC50i (indie/independent) in that the latter is provided with an extra attachment/accessory as well as the minor change of 'skin' colour (with the multi-floor version coming in the iconic Dyson 'yellow', whereas the independent comes in a 'silver/red' design -- and the animal versions coming in a 'purple' base).
These two variations are the only factors that differentiate a DC50 from a DC50i -- both are essentially the exact same vacuum i.e they both have the same weight, specifications and practical functionality -- simply the same vacuum just a different colour and attachments provided.
Comes with 5 Year dyson warranty