Hi - I asked a similar question the other day and didn't get much of response so I am thinking if it does bend it isn't that spectacular. I have a another full size casio keyboard that has the same arpeggios and chords, and most of the presets as mt-65 and I opened it and found lots of trimmer pots inside so it can be manipulated especially the analogue rhythm. I also saw some info on the net for this full-size casio but it didn't look very spectacular.
The MT-65 however is a very collectable casio keyboard and the presets have a very warm and pleasant tone. A tenner is a good price for this and you would find it very difficult not to at least double your money for it on eBay! They sell somewhere beetween £20-50 but people sometimes bid stupid money for them as they do for VL-tones and speak and spells despite the fact the are other in better condition listed too.
I will try and dig out this full-size casio I have because it sounds so similar to the MT-65 and you can pick it up for a £5 as some people after the casio Mt-65 could make do with this untill they have another £50 free!