If by trouble you mean did they require an alignment then I would guess everyone who has done them will tell you they had to get an alignment or, wisely, chose to.
If by trouble you mean is there anything of note with the Belltech spindles then I'd imagine a simple 'Search' would yield all kinds of information about an increased turning radius.
A quick search for 'belltech spindle' yields 89 results, which I imagine would answer just about every question you might have.