After giving thermo a good try, for me it's much more fussy  than a good quality human hair.

 

For clients, I usually sew in or bond wefts, or do fusion, or shrink links.  With a decent quality fusion or the shrinkies,  removal should not cause damage if you do it properly and with extreme care and patience.  An inproper removal where damage results is common with  inexperienced stylists  or an inexperienced DIYer.

 

I don't think Sally's Beauty sells good quality hair and I doubt their keratin is top of the line either.  For good fusion hair and rebond chips, look into http://www.donnabellahair.com - www.donnabellahair.com .   I have been using that brand, as well as So Cap and the bonds are durable, little shedding, but do come out easily  with proper removal.