Please let me know if you have any feedback about this.
What do you think about this?
Do yo have any comments or suggestions?
= 何かコメント、提案はありますか?
What do you think about this?
= これについてどう思いますか?
Please let me know if you have any feedback about this.
= これについて何か意見があったらお知らせください。
1番目と2番目は、"comments or suggestions" と feedback を入れ替えて使うこともできます。
Do you have any feedback?
Please let me know if you have any comments or suggestions.