SBP shift kit or Q-matic

I've been doing a bit of reading on both products and I'm just looking for a few opinions from people's experiences with either kit.

I'm currently riding a new 49cc HS 4-stroke with a hoot gearbox on a 32 spoke (I drilled holes in the current sprocket and used the rag mount to fit.), 21 speed, Rock hopper mountain bike. I live in an area with a few more hills than flats and currently holding at 230 lbs.

The price for either choice will probably be a wash due to the fact that I will likely have to replace the hoot in short order if I stick with it and go with the shift kit.

I'm hoping to be able to cruise at 25 -30 mph on the flats without redlining the motor, 30 mph is currently my top speed with a 44 tooth sprocket, and still be able to pull the hills.

I don't mind doing a bit of tinkering to debug as needed when installed, but due to a health issue I would prefer a bit of dependability going forward.

I appreciate any input available. Thanks

Did you have to do any additional modification with the 4G? The SBP site lists the hoot, grubee II & III as the bolt on gearboxes.

I do have the 5/8" straight shaft on my 142F. I will have to read up on the bushing replacement. The weld will be a little more effort as I would have to disassemble and find a local welder.

Neither route will be a simple bolt on as the q-matic would require me to drill out and reinforce another sprocket to fit my 32 spoke wheel, which makes it tough to roll true...The other fixes require more $ input for a new wheel or some type of adapter.

Thus the request for more experienced opinions as I don't want to discover my choice goes over my head.

Thanks for your input Aleman. I think I will go the SBC kit, seems like those who have them love them.

I'm currently running a thumb shifter on my bike and would have to move the back sprocket shifter to the left side. Do you recommend going with a twist shifter or just working with what I have?

Agree, if you have the money to buy the shift kit at the same time you will save yourself having to tear down the bike and remove the motor to install. If not you could certainly add the shift kit later. I would also suggest considering the 4g belt gearbox, it does bolt up to the SBP kit and is a great combo...it is what I'm running now and It makes for a great versatile ride.