Never having used anything like this, I was dubious about purchasing a Star Tracker as they seem so expensive and Astro isn't something that I do a lot of.
I bit the bullet and purchased the MSM Rotator with the Laser Point and the Wedge and also purchased the Star Focus Filter.
I've used it a couple of times now and setting up to Polaris is really easy with the Laser Pointer. The Wedge is a little temperamental in my opinion. Yes it works well, but when you tightening it up, it moves slightly. it's not an issue if you remember to counter the movement before tightening.
The Star Focus Filter is great too, although the Live View on my Camera isn't as good as I'd like it to be and I've ended up focusing on a distant light. However, once focused, I tape the lens and I'm good to go.
Using the Rotator, I've shoot several 8 minute exposures using ISO 100 and f2.8 and they all look sharp to me.
I've just ordered the Z and V Brackets and will use those in future without the Wedge.
All in all, I'm really impressed and it has spurred me on to keep shooting Astro