Simple Coroutine! One simple coroutine, another utilizing an animation curve to smooth the lerp in a sexy way!

Unit.cs

using UnityEngine;
using System.Collections;

public class Unit : MonoBehaviour 
{
  public Transform target;
  
  void Start(){
    StartCoroutine(MoveTo(target))
  }

	IEnumerator MoveTo(Transform target)
	{
		float t = 0;
		float moveTime = 0.35f;
		Vector3 start = this.transform.position;
		Vector3 end = target.transform.position;

		while (t < 1)
		{
			this.transform.position = Vector3.Lerp(start, end, t);
	
			t += Time.deltaTime / moveTime;
			yield return null;
		}

		this.transform.position = end;
	}
}

UnitSmooth.cs

using UnityEngine;
using System.Collections;

public class Unit : MonoBehaviour 
{
  public Transform target;
  public AnimationCurve smoothCurve;
  public float moveTime = 0.35f;
  
  void Start(){
    StartCoroutine(MoveTo(target))
  }

	IEnumerator MoveTo(Transform target)
	{
		float t = 0;
		Vector3 start = this.transform.position;
		Vector3 end = target.transform.position;

		while (t < 1)
		{
			this.transform.position = Vector3.Lerp(start, end, smoothCurve.Evaluate(t));
	
			t += Time.deltaTime / moveTime;
			yield return null;
		}

		this.transform.position = end;
	}
}