Having multiple instructors is a great idea and is indeed necessary in order for a student to develop their own style. But not at the pre-solo phase!!

Our 141 CPC mandates and encourages the use of several instructors throughout the course of private, instrument, commercial, and instructor training. Although one CFI is the primary, other CFI's perform stage checks and cover flights from time to time.

By all means, fly with however many instructors you want (I think over the course of time i've had 10 or so), it will only help your perspective.

But your school let you down by passing you around like that during your pre-solo training. Too much instability is detrimental to the majority of student pilots at that time. After you do a couple cross-countries its a good idea to branch out. After you get the private rating and go back for advanced training it is a great idea, if you want to, to see all the ways to skin that cat.

In my first 13 hours. I had 11 Instructors. That has to be a record.

And thus broadly follows the original sequence numbers used by the Royal Air Force during and maybe even before World War 2. Published in RAF Air Publication A.P 3225.
Sequence 1. Familiarisation.
2. Preparation for Flight.
3. Air Experience.
4. Effects of Controls.
5. Control of aircraft on ground.
6. Straight and Level.
7. Climbing and Descending.
8. Stalling.
9. Turning.
10. Spinning.
11. Take off and climb downwind position.
12. Approach and Landing.
13. First solo.
14. Consolidation period.
15. Instrument/weather procedure.
16. Low flying.
17. Forced landings.
18. Aerobatics.
19. Night flying.
20. Pilot navigation.
21. Formation flying.

History is indeed facinating.

Multiple Instructors, what's up with that?
 

To revert back to the original question, I think its important to note that different people have different teaching styles and of course individuals respond in different ways so as a customer, if you arrive upon an instructor who you feel you learn from and get along with, by all means you should state you prefer to be taught by that instructor. What you will have to realise however is that you are one of many and that instructor will invariably have other duties and commitments. It may mean your training will take longer in the long run as if there is a certain amount of time between lessons, then a more significant part of the next lesson will be spent refreshing from the previous lesson. Regarding the 172 issue, I personally think its a good thing to be checked out in different aircraft prior to gaining your ppl as you will already have time on type on something you will possibly wish to fly further down the line. Trust me you will soon get fed up and outgrow a c150. If however you think this is too much to take in then by all means state that you wish to only train in the aircraft you are familliar with. I am sure you will find the service provider to have a sympathetic ear.
Hope this helps
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