ARe these any good to buy?

i havnt used them before
I am having a 18-55 kit lens and a 50mm 1.8
Havea look at this

http://www.ebay.com/itm/3-Lenses-Telephoto-Wide-Angle-and-Macro-for-Canon-T3-T3i-T2i-T1i-XSi-XS-/330779238912?pt=Camer​a_Lenses&hash=item4d03​faa200

If you care about image quality then save your money.

No, they're not.

these things are gabage.
Look for a set of Kenko Macro tubes if you are on a budget.

it's find to share links here, but only links to good things.

i'd avoid these and save up for a set of extension tubes; the Polaroid tubes are very good and not expensive.

No...

I think the price indicates the quality

I dont think so

NOPE.

Being a bit of a noob, I bought one of those screw-on wide angle adapters before going on vacation earlier this year. It ruined quite a few shots at the Grand Canyon. It seemed to bend the focal plane and ended up making all the corners and sides very soft. At short focal lengths on my 18-55 kit lens, there was a lot of vignette and barrel distortion.

Don't waste your money.

Alright guys
so i'm not going for them
but im searching for some macro extension tubes. ( i dont know anything about it. but i guess these will make me shoot macro with ease)
while searching on ebay. here is what i found i could get
Please have a look and tellme, is it any good ?
i have a 60D with 18-55,50mm1.8 and sooner ther'l be a 55-250

http://www.ebay.com/itm/Macro​-AF-Auto-Focus-B-Extension-Tube-Set-for-Canon-kenko-US-060283-/300715783190?pt=US_Le​ns_Adapters_Mounts_Tub​es&hash=item46040eb416

Should be okay, they have the electrical contacts for the af and aperture. They appear to be another re-brand of the Vivitar, Zeikos, and Polaroid extension tubes.