Best Strap On Butterfly Vibrator

[Puzzle]

I've been looking at a few vibrators and trying to find reviews and what consumers thought.
Many of the reviews were from the websites themselves which says to me they only want you to buy the product regardless of it's performance.

I was wondering if there were any ladies (or gentlemen) out there who have/used a strap on Butterfly Styled vibrator, something like this style:

Pink Pure Vibes Silicone Strap On Waterproof Butterfly Vibrator: female masturbation : grownupgoods.com.au

some are even rabbit styled:

IMPULSE HYPERSONIC BUNNY by: Swedish Erotica - Discreet Romance Adult Sex Toys Store

I'm only asking because I would like to know what people REALLY think of the performance before i buy into one.

Basically I'd like to know about the vibrating strength factor and the loudness. I have no budget.

P.S Take into account this will be my first vibrator. Hence the vibrator style is external.

Thanks for your help