Yeah, it's a very OP technique. Kuririn was assigned a 75k battle power by the V-Jump and 2nd form Freeza had a battle power of over 1,000,000... and yet he saw the need to dodge every Kienzan spammed by Kuririn, which makes me wonder why he never tried to blind Freeza temporarily with the Taiyo-ken and then throw more Kienzan (since Freeza can't sense chi), but whatever.
I also believe it'd essentialy cut through anything. I don't believe there's a limit. Tenshinhan's Shin Kikoho also comes to mind as a very OP technique, given the fact it affected fricking Semi Perfect Cell when Tenshinhan was, like... below the base Saiyajins?