who has one? are they any good? im looking at [[http://www.amazon.co.uk/dp/B00FN7Q79I/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=KWXDO563LGIM&coliid=I3I6SEP1X5533V neato xv]] or the [[http://www.amazon.co.uk/dp/B00DVKRBI0/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=KWXDO563LGIM&coliid=I3BW5JWVKJHELU robot xd]] any advice? thanks