How do people feel about instant spells here?

INSTANT CURE M1–6

School conjuration (healing)

Casting Time reaction

Range 30 feet

Targets one living creature

Duration instantaneous

Saving Throw Will half (harmless); Spell Resistance yes (harmless)

When a creature starts its turn or it takes damage, you heal and invigorate your target, restoring a number of Hit Points.

Instant cure restores a number of Hit Points to your target depending on the spell’s level.

1st: 1d4 + your Wisdom modifier

2nd: 3d4 + your Wisdom modifier

3rd: 5d4 + your Wisdom modifier

4th: 7d4 + your Wisdom modifier

5th: 9d4 + your Wisdom modifier

6th: 11d4 + your Wisdom modifier

Casting this spell doesn’t provoke attacks of opportunity.

Thoughts?