I would only play with a racket I evaluated before

hi sceptrerad,

since your boyfriend is an experienced player he might have a certain brand or/and model already in his mind.

as mentioned in your other post about buying a violin online, I can only recommend that you go with your boyfriend in a shop or even better a shop next to a tennis court and give him the possibility to evaluate several models.

also here the racket needs to fit all anatomic needs of the player. if you buy anyone and it is the wrong for him - he might play with it, because it is from you, but may ruin his arm and elbow.

regards
wolfgang