What about it? There's a bit of turn-off drain ringing, a modest R+C damper would help with that (maybe 22R + 1n). Turn on is slow and smooth. Doesn't look like it would be a problem at the switching frequency. If the transistor is getting too hot for your liking, use a bigger heatsink, or consider improving drive speed (or, consider getting a smaller and faster transistor).
If you expect highly inductive loads, the R+C might be increased, or a clamp diode or TVS added, to clamp excessive voltage (better to divert peak voltage somewhere, even if it's burned in a TVS, than to make the MOSFET handle it).
I don't recommend the complementary emitter follower, as the 555 output does not swing full +V/GND as it is, and the follower drops 0.7V above that. Discrete alternatives are more complex (a rail-to-rail amplifying stage, then a follower), and integrated alternatives you probably don't have on hand (e.g., TC4420 gate drive IC).
Tim